diff --git a/HANDOFF.md b/HANDOFF.md
index e181c32..833b32c 100644
--- a/HANDOFF.md
+++ b/HANDOFF.md
@@ -61,6 +61,7 @@
 - **B3 学习区已实现（报告 253）**：⌥L 学习区两行式（完整码+简码 / 字根格+识别码），候选窗零改动；词组按输入码对应到字；`LearningHints` 读 `B0-runtime.tsv`，缺失退回 D14。离屏实拍 `docs/design/learning-real-*.png`。**装机后的性能/内存实测仍待候选包**。
 - **B3 草图（已成历史）**（`docs/design/l3-hint.md` + `learning-area-mock.png`）：按用户裁定改为**候选窗零改动**，学习信息只放 ⌥L 学习区，学习区自己两行封顶（单字：字+码+简码 / 字根+识别码依据；词组：前 3 字 + 「逐字 ▸」）。`partial` 未知字根显示 `？`、标注「拆解待核验」；数据源优先 B0-runtime，未覆盖的字走 D14 兜底。**实现未开始，等评审三个细节**。
 - **B5 已收口（ADR-314 / 报告 258）**：冷首键 ~28 ms（学习区关着也一样，用户不可感知）→ 不优化；A1/A2/A3/A5 全部关闭并写触发条件；内存按 ADR-312 双阈值（默认 30 / 学习区 34）。
+- **练习字根显示已对齐学习区（报告 261 §6）**：新增 `PracticeRootRowView`（字形上、大写键位下），识别码题常驻、看字打码题答后显示；窗口高 356。**待装包复验**。
 - **练习流程已修 + 自动化（报告 261）**：输入框换成 `PracticeAnswerView`（不经输入法，回车才判分）；识别码说明改用**正确**末笔·结构、标题不再被按钮压住；新增 `PracticeSession` 纯逻辑与 8 条流程断言（判分/进度/输入过滤）。
 - **练习窗口版式已修正（报告 260）**：翻转坐标从顶部排、固定 460×336、题干居中、进度行不再被裁、A/C 共用纵向基准，并加了版式自检（控件不越界、不与题型控件重叠）。**待装包看真机**。
 - **B4 练习已实现（ADR-313 / 报告 257）**：只看 `full` 出题，题型 A（看字打码）+ C（识别码判断）；进度写 `~/Library/Application Support/Lampyris/practice.tsv`（有界 3,000 行 / 256 KiB、原子写、删除即重置）；快捷键 `hotkey.open_practice` 默认 **⌥K**，入口在设置页快捷键列表；**尚未装包实测**。
diff --git a/docs/reviews/261-practice-flow-and-ui-fixes.md b/docs/reviews/261-practice-flow-and-ui-fixes.md
index bd8fb4c..52ebd76 100644
--- a/docs/reviews/261-practice-flow-and-ui-fixes.md
+++ b/docs/reviews/261-practice-flow-and-ui-fixes.md
@@ -35,3 +35,14 @@
 ## 5. 关联
 
 ADR-313、报告 257/259/260。
+
+## 6. 字根显示改为与学习区一致（2026-11-08 反馈）
+
+**反馈**：练习页把字根和键位交替写成 `土F 丿T 匕X`，阅读不直观。
+
+**改法**：新增 `PracticeRootRowView`，与学习区同一套呈现——**字形在上、大写键位在下**，格子等宽居中；
+- 识别码题型：字根行常驻，作为判断末笔/结构的依据；
+- 看字打码题型：答题后再显示字根行（不提前泄题），反馈文案不再重复拼接字根；
+- 窗口高度 336→356，纵向重排：题型 / 题干 / 提示 / 字根行 / 作答 / 反馈 / 按钮 / 进度。
+
+**测试**：新增字根行断言（键位大写、顺序一致）；版式自检仍要求所有控件在内容区内。
diff --git a/platforms/macos/Sources/Practice.swift b/platforms/macos/Sources/Practice.swift
index f512e1a..749a0cb 100644
--- a/platforms/macos/Sources/Practice.swift
+++ b/platforms/macos/Sources/Practice.swift
@@ -174,8 +174,7 @@ final class PracticeSession {
         guard let question else { return nil }
         let correct = Practice.judgeCode(answer, question: question)
         progress.record(char: question.char, kind: kind, correct: correct)
-        return Result(correct: correct,
-                      explanation: "完整码 \(question.code.uppercased()) · 字根 \(question.rootHint)")
+        return Result(correct: correct, explanation: "完整码 \(question.code.uppercased())")
     }
 
     /// 提交识别码选择；证据说明用**正确**的末笔与结构，而不是用户选的。
diff --git a/platforms/macos/Sources/PracticeRootRowView.swift b/platforms/macos/Sources/PracticeRootRowView.swift
new file mode 100644
index 0000000..a4139b9
--- /dev/null
+++ b/platforms/macos/Sources/PracticeRootRowView.swift
@@ -0,0 +1,38 @@
+import AppKit
+
+/// 练习里的字根行：与学习区同一套样式——上面字形、下面大写键位，一目了然。
+final class PracticeRootRowView: NSView {
+    static let cellWidth: CGFloat = 46
+    static let rowHeight: CGFloat = 36
+    private(set) var roots: [(glyph: String, key: String)] = []
+    override var isFlipped: Bool { true }
+
+    func show(_ roots: [(glyph: String, key: String)]) {
+        self.roots = Array(roots.prefix(6))
+        setAccessibilityLabel(self.roots.map { "\($0.glyph)，键 \($0.key)" }.joined(separator: "；"))
+        needsDisplay = true
+    }
+
+    override func draw(_ dirtyRect: NSRect) {
+        var x: CGFloat = 0
+        for root in roots {
+            let glyphRect = NSRect(x: x, y: 0, width: Self.cellWidth, height: 21)
+            let keyRect = NSRect(x: x, y: 21, width: Self.cellWidth, height: 15)
+            let glyph = NSMutableAttributedString(string: root.glyph, attributes: [
+                .font: NSFont.systemFont(ofSize: 15),
+                .foregroundColor: NSColor.labelColor])
+            var paragraph = NSMutableParagraphStyle()
+            paragraph.alignment = .center
+            glyph.addAttribute(.paragraphStyle, value: paragraph, range: NSRange(location: 0, length: glyph.length))
+            glyph.draw(in: glyphRect)
+            let key = NSMutableAttributedString(string: root.key.uppercased(), attributes: [
+                .font: NSFont.monospacedSystemFont(ofSize: 10.5, weight: .regular),
+                .foregroundColor: NSColor.secondaryLabelColor])
+            paragraph = NSMutableParagraphStyle()
+            paragraph.alignment = .center
+            key.addAttribute(.paragraphStyle, value: paragraph, range: NSRange(location: 0, length: key.length))
+            key.draw(in: keyRect)
+            x += Self.cellWidth
+        }
+    }
+}
diff --git a/platforms/macos/Sources/PracticeWindow.swift b/platforms/macos/Sources/PracticeWindow.swift
index 5c29d22..29465ff 100644
--- a/platforms/macos/Sources/PracticeWindow.swift
+++ b/platforms/macos/Sources/PracticeWindow.swift
@@ -6,7 +6,7 @@ import AppKit
 /// 题型切换 → 题干 → 提示 → 作答区 → 反馈 → 按钮 → 进度。
 final class PracticeWindow: NSObject, NSWindowDelegate {
     static let shared = PracticeWindow()
-    static let contentSize = NSSize(width: 460, height: 336)
+    static let contentSize = NSSize(width: 460, height: 356)
 
     private var window: NSWindow?
     private var content: FlippedView?
@@ -15,6 +15,8 @@ final class PracticeWindow: NSObject, NSWindowDelegate {
     private let feedbackLabel = NSTextField(wrappingLabelWithString: "")
     private let progressLabel = NSTextField(labelWithString: "")
     private let answerView = PracticeAnswerView()
+    private let rootRow = PracticeRootRowView()
+    private var answered = false
     private let kindControl = NSSegmentedControl(labels: PracticeKind.allCases.map(\.title),
                                                  trackingMode: .selectOne, target: nil, action: nil)
     private let strokeTitle = NSTextField(labelWithString: "末笔")
@@ -80,42 +82,46 @@ final class PracticeWindow: NSObject, NSWindowDelegate {
         promptLabel.alignment = .center
         promptLabel.font = .systemFont(ofSize: 12)
         promptLabel.textColor = .secondaryLabelColor
-        promptLabel.frame = NSRect(x: margin, y: 120, width: width - margin * 2, height: 18)
+        promptLabel.frame = NSRect(x: margin, y: 116, width: width - margin * 2, height: 18)
         content.addSubview(promptLabel)
 
-        answerView.frame = NSRect(x: margin, y: 148, width: width - margin * 2, height: 30)
+        // 字根行（与学习区同样式：字形上、键位下）
+        rootRow.frame = NSRect(x: margin, y: 136, width: width - margin * 2, height: PracticeRootRowView.rowHeight)
+        content.addSubview(rootRow)
+
+        answerView.frame = NSRect(x: margin, y: 176, width: width - margin * 2, height: 30)
         answerView.onReturn = { [weak self] text in self?.submitCode(text) }
         content.addSubview(answerView)
 
         // 识别码：两行带标题的按钮组
         strokeTitle.font = .systemFont(ofSize: 11)
         strokeTitle.textColor = .secondaryLabelColor
-        strokeTitle.frame = NSRect(x: margin, y: 150, width: 46, height: 18)
+        strokeTitle.frame = NSRect(x: margin, y: 182, width: 46, height: 18)
         content.addSubview(strokeTitle)
         for (index, button) in strokeButtons.enumerated() {
             button.target = self
             button.action = #selector(pickStroke(_:))
             button.tag = index
             button.bezelStyle = .rounded
-            button.frame = NSRect(x: margin + 52 + CGFloat(index) * 72, y: 144, width: 66, height: 28)
+            button.frame = NSRect(x: margin + 52 + CGFloat(index) * 72, y: 176, width: 66, height: 28)
             content.addSubview(button)
         }
         structureTitle.font = .systemFont(ofSize: 11)
         structureTitle.textColor = .secondaryLabelColor
-        structureTitle.frame = NSRect(x: margin, y: 188, width: 46, height: 18)
+        structureTitle.frame = NSRect(x: margin, y: 220, width: 46, height: 18)
         content.addSubview(structureTitle)
         for (index, button) in structureButtons.enumerated() {
             button.target = self
             button.action = #selector(pickStructure(_:))
             button.tag = index
             button.bezelStyle = .rounded
-            button.frame = NSRect(x: margin + 52 + CGFloat(index) * 116, y: 182, width: 108, height: 28)
+            button.frame = NSRect(x: margin + 52 + CGFloat(index) * 116, y: 214, width: 108, height: 28)
             content.addSubview(button)
         }
 
         feedbackLabel.alignment = .center
         feedbackLabel.font = .systemFont(ofSize: 12)
-        feedbackLabel.frame = NSRect(x: margin, y: 218, width: width - margin * 2, height: 40)
+        feedbackLabel.frame = NSRect(x: margin, y: 250, width: width - margin * 2, height: 40)
         content.addSubview(feedbackLabel)
 
         let next = NSButton(title: "下一题", target: self, action: #selector(nextQuestion))
@@ -123,13 +129,13 @@ final class PracticeWindow: NSObject, NSWindowDelegate {
         let export = NSButton(title: "打开进度文件", target: self, action: #selector(openProgress))
         for (index, button) in [next, reveal, export].enumerated() {
             button.bezelStyle = .rounded
-            button.frame = NSRect(x: margin + CGFloat(index) * 130, y: 264, width: 120, height: 28)
+            button.frame = NSRect(x: margin + CGFloat(index) * 130, y: 292, width: 120, height: 28)
             content.addSubview(button)
         }
 
         progressLabel.font = .systemFont(ofSize: 11)
         progressLabel.textColor = .secondaryLabelColor
-        progressLabel.frame = NSRect(x: margin, y: 300, width: width - margin * 2, height: 16)
+        progressLabel.frame = NSRect(x: margin, y: 326, width: width - margin * 2, height: 16)
         content.addSubview(progressLabel)
         return content
     }
@@ -137,6 +143,7 @@ final class PracticeWindow: NSObject, NSWindowDelegate {
     private func applyKindVisibility() {
         let isCode = kind == .code
         answerView.isHidden = !isCode
+        rootRow.isHidden = !(kind == .recognition || answered)
         strokeTitle.isHidden = isCode
         structureTitle.isHidden = isCode
         for button in strokeButtons + structureButtons { button.isHidden = isCode }
@@ -160,6 +167,7 @@ final class PracticeWindow: NSObject, NSWindowDelegate {
     }
 
     private func showCurrent() {
+        answered = false
         answerView.clear()
         pendingStroke = nil
         pendingStructure = nil
@@ -176,7 +184,9 @@ final class PracticeWindow: NSObject, NSWindowDelegate {
         questionLabel.stringValue = question.char
         promptLabel.stringValue = kind == .code
             ? "打出它的完整五笔码（\(question.code.count) 位）"
-            : "拆解：\(question.rootHint)"
+            : "按上面的字根与键位，判断末笔与结构"
+        rootRow.show(question.roots)
+        rootRow.isHidden = kind != .recognition
         progressLabel.stringValue = session.summary
         if kind == .code { window?.makeFirstResponder(answerView) }
     }
@@ -214,6 +224,11 @@ final class PracticeWindow: NSObject, NSWindowDelegate {
     }
 
     private func finish(_ result: PracticeSession.Result) {
+        answered = true
+        if let question = current {
+            rootRow.show(question.roots)
+            rootRow.isHidden = false
+        }
         feedbackLabel.stringValue = (result.correct ? "✓ 正确 · " : "✗ 再想想 · ") + result.explanation
         feedbackLabel.textColor = result.correct ? .systemGreen : .systemOrange
         progressLabel.stringValue = session.summary
diff --git a/platforms/macos/dev-preview.sh b/platforms/macos/dev-preview.sh
index e860b75..8dace1e 100755
--- a/platforms/macos/dev-preview.sh
+++ b/platforms/macos/dev-preview.sh
@@ -56,6 +56,7 @@ swiftc -g -Onone -warnings-as-errors -module-name LampyrisPreview \
   "${SCRIPT_DIR}/Sources/Practice.swift" \
   "${SCRIPT_DIR}/Sources/PracticeWindow.swift" \
   "${SCRIPT_DIR}/Sources/PracticeAnswerView.swift" \
+  "${SCRIPT_DIR}/Sources/PracticeRootRowView.swift" \
   "${SCRIPT_DIR}/Sources/WubiHints.generated.swift" \
   "${ROOT}/target/debug/libime_ffi.a" \
   -framework AppKit -o "${BIN}"
diff --git a/platforms/macos/tests/test-appearance-contract.py b/platforms/macos/tests/test-appearance-contract.py
index a67d9c1..2a5fb6e 100644
--- a/platforms/macos/tests/test-appearance-contract.py
+++ b/platforms/macos/tests/test-appearance-contract.py
@@ -25,7 +25,7 @@ def test_native_appearance_contrast_and_geometry(self):
                 (["swiftc", "-warnings-as-errors", "-I", str(ROOT / "crates/ime-ffi/include"),
                   str(temporary / "main.swift"),
                   *[str(ROOT / "platforms/macos/Sources" / name) for name in
-                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "Settings.swift", "Feedback.swift", "InfoWindow.swift",
+                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "PracticeRootRowView.swift", "Settings.swift", "Feedback.swift", "InfoWindow.swift",
                      "UserDictionary.swift", "Lookup.swift"]],
                   str(ROOT / "target/release/libime_ffi.a"), "-framework", "AppKit",
                   "-o", str(temporary / "probe")], 45),
diff --git a/platforms/macos/tests/test-candidate-presentation.py b/platforms/macos/tests/test-candidate-presentation.py
index ad5d230..d8ffe94 100644
--- a/platforms/macos/tests/test-candidate-presentation.py
+++ b/platforms/macos/tests/test-candidate-presentation.py
@@ -28,7 +28,7 @@ def test_native_view_and_real_ffi_paging(self):
                   str(temporary / "main.swift"),
                   str(ROOT / "platforms/macos/tests/LocalAcceptanceEvidence.swift"),
                   *[str(ROOT / "platforms/macos/Sources" / name) for name in
-                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "StateHUD.swift"]],
+                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "PracticeRootRowView.swift", "StateHUD.swift"]],
                   str(ROOT / "target/release/libime_ffi.a"), "-framework", "AppKit",
                   "-o", str(temporary / "probe")], 45),
                 ([str(temporary / "probe"), str(temporary), str(output)], 10),
diff --git a/platforms/macos/tests/test-composition-navigation.py b/platforms/macos/tests/test-composition-navigation.py
index 355f190..13c805e 100644
--- a/platforms/macos/tests/test-composition-navigation.py
+++ b/platforms/macos/tests/test-composition-navigation.py
@@ -24,7 +24,7 @@ def test_real_swift_event_classifier_with_private_config(self):
                 (["swiftc", "-warnings-as-errors", "-I", str(ROOT / "crates/ime-ffi/include"),
                   str(temporary / "main.swift"),
                   *[str(ROOT / "platforms/macos/Sources" / name) for name in
-                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift"]],
+                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "PracticeRootRowView.swift"]],
                   str(ROOT / "target/release/libime_ffi.a"), "-framework", "AppKit",
                   "-o", str(temporary / "probe")], 45),
                 ([str(temporary / "probe"), str(temporary)], 10),
diff --git a/platforms/macos/tests/test-preview-menu.py b/platforms/macos/tests/test-preview-menu.py
index ae4fde9..fda4bbf 100644
--- a/platforms/macos/tests/test-preview-menu.py
+++ b/platforms/macos/tests/test-preview-menu.py
@@ -43,7 +43,7 @@ def test_real_shared_menu_and_private_session(self):
                 (['swiftc', '-warnings-as-errors', '-I', str(ROOT / 'crates/ime-ffi/include'),
                   str(temporary / 'main.swift'),
                   str(ROOT / "platforms/macos/tests/LocalAcceptanceEvidence.swift"),
-                  *[str(ROOT / 'platforms/macos/Sources' / name) for name in ['ImeSession.swift', 'Config.swift', 'CandidateWindow.swift', 'CaretPlacement.swift', 'LearningHints.swift', 'Practice.swift', 'PracticeWindow.swift', 'PracticeAnswerView.swift', 'InputMenu.swift']],
+                  *[str(ROOT / 'platforms/macos/Sources' / name) for name in ['ImeSession.swift', 'Config.swift', 'CandidateWindow.swift', 'CaretPlacement.swift', 'LearningHints.swift', 'Practice.swift', 'PracticeWindow.swift', 'PracticeAnswerView.swift', 'PracticeRootRowView.swift', 'InputMenu.swift']],
                   str(ROOT / 'platforms/macos/Preview/InputMenuPreview.swift'),
                   str(ROOT / 'target/release/libime_ffi.a'), '-framework', 'AppKit', '-o', str(temporary / 'probe')], 45),
                 ([str(temporary / 'probe'), str(temporary), str(ROOT / 'data/generated')], 10),
diff --git a/platforms/macos/tests/test-settings-presentation.py b/platforms/macos/tests/test-settings-presentation.py
index b3d7793..5a2377f 100644
--- a/platforms/macos/tests/test-settings-presentation.py
+++ b/platforms/macos/tests/test-settings-presentation.py
@@ -28,7 +28,7 @@ def test_native_panes_and_private_configuration(self):
                   str(temporary / "main.swift"),
                   str(ROOT / "platforms/macos/tests/LocalAcceptanceEvidence.swift"),
                   *[str(ROOT / "platforms/macos/Sources" / name) for name in
-                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "Settings.swift", "Feedback.swift", "InfoWindow.swift",
+                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "PracticeRootRowView.swift", "Settings.swift", "Feedback.swift", "InfoWindow.swift",
                      "UserDictionary.swift", "Lookup.swift"]],
                   str(ROOT / "target/release/libime_ffi.a"), "-framework", "AppKit",
                   "-o", str(temporary / "probe")], 45),
diff --git a/platforms/macos/tests/test-tools-presentation.py b/platforms/macos/tests/test-tools-presentation.py
index 01ffeaa..806a5e1 100644
--- a/platforms/macos/tests/test-tools-presentation.py
+++ b/platforms/macos/tests/test-tools-presentation.py
@@ -28,7 +28,7 @@ def test_native_forms_and_information_states(self):
                   str(temporary / "main.swift"),
                   str(ROOT / "platforms/macos/tests/LocalAcceptanceEvidence.swift"),
                   *[str(ROOT / "platforms/macos/Sources" / name) for name in
-                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "Settings.swift", "Feedback.swift", "InfoWindow.swift",
+                    ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift", "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "PracticeRootRowView.swift", "Settings.swift", "Feedback.swift", "InfoWindow.swift",
                      "UserDictionary.swift", "Lookup.swift"]],
                   str(ROOT / "target/release/libime_ffi.a"), "-framework", "AppKit",
                   "-o", str(temporary / "probe")], 45),
diff --git a/platforms/macos/tests/test-wubi-learning.py b/platforms/macos/tests/test-wubi-learning.py
index 3718e41..502829b 100644
--- a/platforms/macos/tests/test-wubi-learning.py
+++ b/platforms/macos/tests/test-wubi-learning.py
@@ -34,7 +34,7 @@ def test_real_ffi_teaching_model(self):
                   str(ROOT / "platforms/macos/tests/LocalAcceptanceEvidence.swift"),
                   *[str(ROOT / "platforms/macos/Sources" / name) for name in
                     ["ImeSession.swift", "Config.swift", "CandidateWindow.swift", "CaretPlacement.swift",
-                     "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift"]],
+                     "LearningHints.swift", "Practice.swift", "PracticeWindow.swift", "PracticeAnswerView.swift", "PracticeRootRowView.swift"]],
                   str(ROOT / "target/release/libime_ffi.a"), "-framework", "AppKit",
                   "-o", str(temporary / "probe")], 45),
                 ([str(temporary / "probe"), str(temporary), str(output)], 10),
diff --git a/platforms/macos/tests/wubi-learning.swift b/platforms/macos/tests/wubi-learning.swift
index d6cd9dd..a9915ae 100644
--- a/platforms/macos/tests/wubi-learning.swift
+++ b/platforms/macos/tests/wubi-learning.swift
@@ -53,6 +53,10 @@ guard let recognitionResult = recognitionSession.submitRecognition(stroke: expec
 require(recognitionResult.correct, "正确末笔/结构应判对")
 require(recognitionResult.explanation.contains(expected.letter), "说明应包含正确字母")
 require(recognitionResult.explanation.contains(expected.stroke), "说明应包含**正确**的末笔（不是用户选的）")
+// 练习字根行与学习区同样式：字形上、键位下（大写）。
+let rootRow = PracticeRootRowView(frame: NSRect(x: 0, y: 0, width: 400, height: 36))
+rootRow.show([("土", "F"), ("丿", "T"), ("匕", "X")])
+require(rootRow.roots.map(\.key) == ["F", "T", "X"], "字根行键位大写且顺序一致")
 // 输入视图只接受 a–y、退格与回车。
 let answer = PracticeAnswerView(frame: NSRect(x: 0, y: 0, width: 200, height: 30))
 var submitted: String?