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They help the menu or window stand out from the background by reinforcing its dimensions. They also block out the noise of the content beneath the window by darkening the area around it with a shadow.
这些阴影通过增加菜单或者窗口的维度来使它们变得醒目，同时也能来把这块区域变暗以阻止下方内容的干扰。
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