diff --git a/LearnEnglish/LearnEnglish/Views/QuizViewController.swift b/LearnEnglish/LearnEnglish/Views/QuizViewController.swift
index f48cb48..c13b878 100644
--- a/LearnEnglish/LearnEnglish/Views/QuizViewController.swift
+++ b/LearnEnglish/LearnEnglish/Views/QuizViewController.swift
@@ -28,6 +28,12 @@ final class QuizViewController: UIViewController {
     private let promptStack = UIStackView()
     private let inputStack = UIStackView()
     private let resultStack = UIStackView()
+    private let navSpeakerItem = UIBarButtonItem(
+        image: UIImage(systemName: "speaker.wave.2.fill"),
+        style: .plain,
+        target: nil,
+        action: nil
+    )
 
     private var current: QuizQuestion? {
         questions.indices.contains(currentIndex) ? questions[currentIndex] : nil
@@ -110,12 +116,9 @@ final class QuizViewController: UIViewController {
         nextButton.configuration = nextConfig
         nextButton.addAction(UIAction { [weak self] _ in self?.primaryButtonTapped() }, for: .touchUpInside)
 
-        navigationItem.rightBarButtonItem = UIBarButtonItem(
-            image: UIImage(systemName: "speaker.wave.2.fill"),
-            style: .plain,
-            target: self,
-            action: #selector(speakCurrentWord)
-        )
+        navSpeakerItem.target = self
+        navSpeakerItem.action = #selector(speakCurrentWord)
+        navigationItem.rightBarButtonItem = navSpeakerItem
 
         let headerStack = UIStackView(arrangedSubviews: [progressView, countLabel])
         headerStack.axis = .vertical
@@ -163,6 +166,8 @@ final class QuizViewController: UIViewController {
         resultLabel.isHidden = true
         resultPhoneticLabel.isHidden = true
 
+        navigationItem.rightBarButtonItem = config.mode == .zhToEn ? nil : navSpeakerItem
+
         let isSpelling = config.mode == .spelling
         let isDictation = config.mode == .dictation
         let isChoice = !isSpelling && !isDictation
@@ -290,6 +295,7 @@ final class QuizViewController: UIViewController {
                 icon.transform = .identity
             }
         }
+        navigationItem.rightBarButtonItem = navSpeakerItem
         showResult(correct, for: question)
     }
 
diff --git a/LearnEnglish/LearnEnglish/Views/WordDetailViewController.swift b/LearnEnglish/LearnEnglish/Views/WordDetailViewController.swift
index 629dafb..1797b75 100644
--- a/LearnEnglish/LearnEnglish/Views/WordDetailViewController.swift
+++ b/LearnEnglish/LearnEnglish/Views/WordDetailViewController.swift
@@ -2,16 +2,17 @@ import UIKit
 
 final class WordDetailViewController: UIViewController {
     private let word: Word
+    private let categoryName: String
     private let speech = SpeechService.shared
 
     private let speakButton = UIButton(type: .system)
     private let exampleSpeakButton = UIButton(type: .system)
     private let contentStack = UIStackView()
     private var speechObserver: NSObjectProtocol?
-    private var didAnimateEntry = false
 
-    init(word: Word) {
+    init(word: Word, categoryName: String = "") {
         self.word = word
+        self.categoryName = categoryName
         super.init(nibName: nil, bundle: nil)
     }
 
@@ -27,7 +28,7 @@ final class WordDetailViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         view.backgroundColor = .systemBackground
-        title = word.word
+        title = categoryName
         navigationItem.largeTitleDisplayMode = .never
         buildLayout()
         updateSpeakState()
@@ -38,14 +39,6 @@ final class WordDetailViewController: UIViewController {
         }
     }
 
-    override func viewDidAppear(_ animated: Bool) {
-        super.viewDidAppear(animated)
-        if !didAnimateEntry {
-            didAnimateEntry = true
-            contentStack.animateEntry(distance: 16, duration: 0.35)
-        }
-    }
-
     private func updateSpeakState() {
         let wordSpeaking = speech.isSpeaking(word.word)
         speakButton.configuration?.image = UIImage(
diff --git a/LearnEnglish/LearnEnglish/Views/WordListViewController.swift b/LearnEnglish/LearnEnglish/Views/WordListViewController.swift
index c4222dd..597ff57 100644
--- a/LearnEnglish/LearnEnglish/Views/WordListViewController.swift
+++ b/LearnEnglish/LearnEnglish/Views/WordListViewController.swift
@@ -148,6 +148,6 @@ extension WordListViewController: UITableViewDataSource, UITableViewDelegate {
     func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
         Haptics.selection()
         navigationController?.pushViewController(
-            WordDetailViewController(word: category.words[indexPath.row]), animated: true)
+            WordDetailViewController(word: category.words[indexPath.row], categoryName: category.name), animated: true)
     }
 }