diff --git a/packages/client/ui-trajectory/src/client/index.ts b/packages/client/ui-trajectory/src/client/index.ts
index a325f31410..1b660e11ae 100644
--- a/packages/client/ui-trajectory/src/client/index.ts
+++ b/packages/client/ui-trajectory/src/client/index.ts
@@ -55,7 +55,7 @@ export function apply(ctx: Context): void {
           const response = await fetch(url)
           if (!response.ok) {
             const detail = await response.text().catch(() => '')
-            throw new Error(`导出失败：HTTP ${response.status}${detail === '' ? '' : ` ${detail}`}`)
+            throw new Error(`Export failed: HTTP ${response.status}${detail === '' ? '' : ` ${detail}`}`)
           }
           downloadBlob(await response.blob(), sessionLogZipFilename(sessionId))
         },
diff --git a/packages/client/ui-trajectory/src/client/locales.ts b/packages/client/ui-trajectory/src/client/locales.ts
index aba527dd2b..b226974160 100644
--- a/packages/client/ui-trajectory/src/client/locales.ts
+++ b/packages/client/ui-trajectory/src/client/locales.ts
@@ -35,20 +35,20 @@ declare module '@deepseek-ai/dsh-client-ui-slots' {
 export const zh: Record<TrajectoryKey, string> = {
   'view.trajectory': '轨迹',
   'toolbar.aria': '轨迹工具栏',
-  'toolbar.duration': '时长',
-  'toolbar.useActualDuration': '使用实际时长',
-  'toolbar.useEqualWidth': '使用等宽时长',
+  'toolbar.duration': 'Duration',
+  'toolbar.useActualDuration': 'Use actual duration',
+  'toolbar.useEqualWidth': 'Use equal-width operations',
   'toolbar.actualTime': '实际时间',
-  'toolbar.turns': '轮次',
-  'toolbar.expandTurns': '展开轮次',
-  'toolbar.collapseTurns': '折叠轮次',
-  'toolbar.calls': '调用',
-  'toolbar.expandCalls': '展开调用',
-  'toolbar.collapseCalls': '折叠调用',
-  'toolbar.export': '导出',
-  'toolbar.exportAria': '导出会话日志',
-  'toolbar.exporting': '导出中…',
-  'toolbar.exportTitle': '导出会话日志（ZIP，含子代理）',
+  'toolbar.turns': 'Turns',
+  'toolbar.expandTurns': 'Expand turns',
+  'toolbar.collapseTurns': 'Collapse turns',
+  'toolbar.calls': 'Calls',
+  'toolbar.expandCalls': 'Expand calls',
+  'toolbar.collapseCalls': 'Collapse calls',
+  'toolbar.export': 'Export',
+  'toolbar.exportAria': 'Export session log',
+  'toolbar.exporting': 'Exporting…',
+  'toolbar.exportTitle': 'Export session log (ZIP, includes subagents)',
   'toolbar.search': '搜索轨迹',
   'toolbar.searchPlaceholder': '搜索',
 }
diff --git a/packages/client/ui-trajectory/tests/toolbar.spec.tsx b/packages/client/ui-trajectory/tests/toolbar.spec.tsx
index 820af51ec7..e2b761143a 100644
--- a/packages/client/ui-trajectory/tests/toolbar.spec.tsx
+++ b/packages/client/ui-trajectory/tests/toolbar.spec.tsx
@@ -39,7 +39,7 @@ describe('TrajectoryToolbar export', () => {
   it('renders the export button and dispatches the export callback on click', () => {
     const onExport = vi.fn()
     render(<TrajectoryToolbar {...baseProps({ onExport })} />)
-    const button = screen.getByRole('button', { name: '导出会话日志' })
+    const button = screen.getByRole('button', { name: 'Export session log' })
     fireEvent.click(button)
     expect(onExport).toHaveBeenCalledTimes(1)
   })
@@ -47,15 +47,15 @@ describe('TrajectoryToolbar export', () => {
   it('disables the button while an export is in flight and blocks dispatch', () => {
     const onExport = vi.fn()
     render(<TrajectoryToolbar {...baseProps({ exporting: true, onExport })} />)
-    const button = screen.getByRole('button', { name: '导出会话日志' }) as HTMLButtonElement
+    const button = screen.getByRole('button', { name: 'Export session log' }) as HTMLButtonElement
     expect(button.disabled).toBe(true)
     fireEvent.click(button)
     expect(onExport).not.toHaveBeenCalled()
   })
 
   it('surfaces an export failure as the button title', () => {
-    render(<TrajectoryToolbar {...baseProps({ exportError: '导出失败：internal boom' })} />)
-    const button = screen.getByRole('button', { name: '导出会话日志' })
-    expect(button.title).toBe('导出失败：internal boom')
+    render(<TrajectoryToolbar {...baseProps({ exportError: 'Export failed: internal boom' })} />)
+    const button = screen.getByRole('button', { name: 'Export session log' })
+    expect(button.title).toBe('Export failed: internal boom')
   })
 })
diff --git a/packages/client/ui-trajectory/tests/views.spec.tsx b/packages/client/ui-trajectory/tests/views.spec.tsx
index 81fc9df818..214d962903 100644
--- a/packages/client/ui-trajectory/tests/views.spec.tsx
+++ b/packages/client/ui-trajectory/tests/views.spec.tsx
@@ -336,9 +336,9 @@ describe('tab switching in ConversationRoot', () => {
     expect(screen.getByRole('toolbar', { name: '轨迹工具栏' })).toBeTruthy()
     expect(screen.getByRole('region', { name: 'Trajectory timeline' })).toBeTruthy()
     expect(view.container.querySelector('[data-conversation-composer-overlay]')).toBeTruthy()
-    fireEvent.click(screen.getByRole('button', { name: '折叠轮次' }))
+    fireEvent.click(screen.getByRole('button', { name: 'Collapse turns' }))
     expect(view.container.querySelector('[data-collapsed-summary="turn"]')).toBeTruthy()
-    fireEvent.click(screen.getByRole('button', { name: '展开轮次' }))
+    fireEvent.click(screen.getByRole('button', { name: 'Expand turns' }))
     expect(screen.getByRole('row', { name: /USER/ })).toBeTruthy()
     expect(screen.queryByTestId('chat-body')).toBeNull()
     await vi.waitFor(() => {
@@ -552,10 +552,10 @@ describe('tab switching in ConversationRoot', () => {
     expect(screen.getByRole('toolbar', { name: '轨迹工具栏' })).toBeTruthy()
     expect(screen.getByText('No timing data')).toBeTruthy()
     expect(screen.getByRole<HTMLButtonElement>('button', {
-      name: '折叠轮次',
+      name: 'Collapse turns',
     }).disabled).toBe(false)
     expect(screen.getByRole<HTMLButtonElement>('button', {
-      name: '折叠调用',
+      name: 'Collapse calls',
     }).disabled).toBe(false)
     expect(screen.queryByRole('row')).toBeNull()
     expect(screen.queryByText(/turns ·/)).toBeNull()
@@ -1127,7 +1127,7 @@ describe('session log export', () => {
     const b = await bench(historySnapshot(NODES))
     mount(b.slots)
     fireEvent.click(screen.getByRole('tab', { name: 'Trajectory' }))
-    fireEvent.click(screen.getByRole('button', { name: '导出会话日志' }))
+    fireEvent.click(screen.getByRole('button', { name: 'Export session log' }))
     await vi.waitFor(() => {
       expect(fetchMock).toHaveBeenCalledOnce()
     })
@@ -1143,7 +1143,7 @@ describe('session log export', () => {
     const b = await bench(historySnapshot(NODES))
     mount(b.slots)
     fireEvent.click(screen.getByRole('tab', { name: 'Trajectory' }))
-    fireEvent.click(screen.getByRole('button', { name: '导出会话日志' }))
+    fireEvent.click(screen.getByRole('button', { name: 'Export session log' }))
     await vi.waitFor(() => {
       const alert = screen.queryByRole('alert')
       expect(alert).not.toBeNull()
@@ -1167,7 +1167,7 @@ describe('TrajectoryView branches', () => {
         setActualDuration={(value) => { firstDuration.set(value) }}
       />,
     )
-    const duration = screen.getByRole('button', { name: '使用实际时长' })
+    const duration = screen.getByRole('button', { name: 'Use actual duration' })
 
     expect(duration.getAttribute('aria-pressed')).toBe('false')
     fireEvent.click(duration)
@@ -1183,7 +1183,7 @@ describe('TrajectoryView branches', () => {
         setActualDuration={(value) => { restoredDuration.set(value) }}
       />,
     )
-    expect(screen.getByRole('button', { name: '使用实际时长' }).getAttribute('aria-pressed'))
+    expect(screen.getByRole('button', { name: 'Use actual duration' }).getAttribute('aria-pressed'))
       .toBe('true')
   })