We're also fans of Quick Look, one of OS X's best time-saving features for getting a glimpse of a file with a simple stroke of the space bar.

我们同样喜爱在OS X中最节约时间的特性之一的Quick Look，有了它，只需轻轻一击空格键便能浏览文件。

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Take a quick look at the file and you would know that.

快速浏览一下文件，您将了解。

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Before you jump into looking at the different kinds of extensions, let's take a quick look at the folder and file layout used by most of them.

在深入探究不同类型的扩展之前，让我们先来看看为大多数扩展使用的文件夹和文件布局。

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