This puts the To header in edit mode.

这就将To header置于编辑模式。

youdao

Various tests in Edit Mode, such as

Edit 模式下的各种测试，比如

youdao

By default, the form is not in edit mode.

默认情况下，表单不处于编辑模式。

youdao

To reverse some edit you made, make sure you're in GUI mode and hit "u".

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