把门关上，否则亮光会使底片变灰的。

Shut the door or the light will fog the film.

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现在该按钮显示为Disable，并且控制项不再是变灰的。

Now the button reads Disable, and the controls are no longer grayed out.

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动态 UI 的最简单形式是使不可用的菜单项或按钮变灰的 UI。

The simplest form of dynamic UI is one that grays out menu items or buttons that are unavailable.

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