注意：在撰写本文时，有一个bug在启用桌面效果时会影响xclock。

Note: at the time of writing, there is a bug that affects xclock when desktop effects are enabled.

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如果您的xclock例子与本文的不同，您可能要关闭桌面效果一段时间。

If your xclock examples don't look like the ones in this article, you may want to try switching off desktop effects for a while.

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这个价格为99美分的应用可以拍摄桌子表面的照片，然后可以在上面呈现出相同的桌面效果，使平板看起来像透明的一样。

The 99-cent app can take a picture of a table top and then be used to pan over that same table top, making the tablet appear to be transparent.

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