diff --git a/src/Semi.Avalonia/Locale/en-us.axaml b/src/Semi.Avalonia/Locale/en-us.axaml
index cc18fcb..05b3e0e 100644
--- a/src/Semi.Avalonia/Locale/en-us.axaml
+++ b/src/Semi.Avalonia/Locale/en-us.axaml
@@ -9,6 +9,7 @@
     <!--  TimePicker  -->
     <x:String x:Key="STRING_TIMEPICKER_HOUR_TEXT">hour</x:String>
     <x:String x:Key="STRING_TIMEPICKER_MINUTE_TEXT">minute</x:String>
+    <x:String x:Key="STRING_TIMEPICKER_SECOND_TEXT">second</x:String>
     <!--  TextBox/SelectableTextBox flyout  -->
     <x:String x:Key="STRING_MENU_CUT">Cut</x:String>
     <x:String x:Key="STRING_MENU_COPY">Copy</x:String>
diff --git a/src/Semi.Avalonia/Locale/zh-cn.axaml b/src/Semi.Avalonia/Locale/zh-cn.axaml
index 81422df..1162949 100644
--- a/src/Semi.Avalonia/Locale/zh-cn.axaml
+++ b/src/Semi.Avalonia/Locale/zh-cn.axaml
@@ -9,6 +9,7 @@
     <!--  TimePicker  -->
     <x:String x:Key="STRING_TIMEPICKER_HOUR_TEXT">时</x:String>
     <x:String x:Key="STRING_TIMEPICKER_MINUTE_TEXT">分</x:String>
+    <x:String x:Key="STRING_TIMEPICKER_SECOND_TEXT">秒</x:String>
     <!--  TextBox/SelectableTextBox flyout  -->
     <x:String x:Key="STRING_MENU_CUT">剪切</x:String>
     <x:String x:Key="STRING_MENU_COPY">复制</x:String>