之前已经出现了超薄windows系统笔记本，但是很少能够跟苹果笔记本最厚部分只有17毫米相比。

There are thin Windows-based laptops already, but few quite as thin as the MacBook Air–which measures just 17 millimeters at its thickest point.

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对于入门者来说，只有很少的前提要求，而这些要求对于Web开发人员来说，都是相当标准的，所以它们可能已经安装了。

For starters, there are just a few prerequisites, and they're all pretty standard for Web developers, so you may already have them installed.

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尽管只有很少用户可以使用，目前围绕Chrome已经形成了一个小型扩展生态系统。

A small ecosystem of Chrome extensions is already growing up around Chrome, even though only a small number of Chrome users are currently able to use them.

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