When the undo command is unavailable (dimmed), you cannot undo the previous action.

当撤销命令不可用时(变灰)，则不能撤销之前的操作。

youdao

When the undo command is unavailable (dimmed), you cannot undo the previous action.

当撤销命令不可用时(变灰)，则不能撤销之前的操作。

youdao