他们有一个咖啡键和一个热狗键，当有人点了个热狗时，他们点击热狗键，就会出个分类总金额。

They have a Cappuccino button or a hot dog button, and when someone orders a hot dog they hit the button and up comes an itemized total.

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如果想查看更多结果，可以在完成输入之后敲击回车键，这样标准的搜索结果页面就会显现出来。它非常简洁，同样搜索结果也有组织地按分类排列。

If you want to see more results you can just hit Enter when you've finished typing and you'll be taken to the standard search results page.

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为了生成可供各个项目重用的缓存键，可以将键生成分类。

In order to make the generation of the cache keys reusable for individual projects, separate the key generation into its own class.

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So let's think about how we can classify single and double and triple bonds, which is what we're really used to dealing with in terms of these sigma bonds and these pi bonds.

让我们想想怎么来分类单键双键,和三键，这在我们在考虑sigma键,和π键是很有用的。

麻省理工公开课 - 化学原理课程节选