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ios/OralTrainer/Views/PlayerSectionView.swift

@@ -233,6 +233,7 @@ struct SentenceExplanationSheet: View {
     let courseTitle: String
     let sentence: SentenceBoundary
 
+    @Environment(\.dismiss) private var dismiss
     @State private var explanation = ""
     @State private var errorMessage: String?
 
@@ -264,6 +265,18 @@ struct SentenceExplanationSheet: View {
             .background(Color.white.ignoresSafeArea())
             .navigationTitle("句子讲解")
             .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .navigationBarTrailing) {
+                    Button {
+                        dismiss()
+                    } label: {
+                        Image(systemName: "xmark.circle.fill")
+                            .font(.system(size: 22, weight: .semibold))
+                            .foregroundColor(Theme.textMuted)
+                    }
+                    .accessibilityLabel("关闭句子讲解")
+                }
+            }
         }
         .task {
             guard explanation.isEmpty, errorMessage == nil else { return }