Message in Chinese (Traditional) (中文(繁體))![](/img/flags/zh-cht.png)
引數必須衍生自 <var>X</var>。
Unlocalized message![](/img/flags/en.png)
The argument must be derived from <var>X</var>.
Search by Google引數必須衍生自 <var>X</var>。
The argument must be derived from <var>X</var>.
Search by Google