这座城市仍未完工，感觉它有点像一个主题公园。

The city is still unfinished, and it feels a bit like a theme park.

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以一个讨论数据库为例，假设它有10,000个主题和100,000个响应文档。

Let's take for example a discussion database with 10,000 main topics and 100,000 response documents.

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它有着宏大的历史背景，全文的组织架构也都是围绕着一个具体的地点展开，而不是讲述一个家庭或是某个人物的故事。目前他所能呈现的只是一些片段和缩略的主题。

Taking on such a wide swath of history and using as its organizing principle a location rather than a family or a single character, he can present only fragments and headlines.

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N 2 So any chemist should be able to just look at n 2 and know that it's a triple bond, but that's not something that we've learned how did to do yet, so let's go ahead and start a new topic that's going to allow us to have some sort of sense of what the valence electron configuration, which includes whether something's a single or double or a triple bond can be figured out for any given molecule.

任何一个化学家都应该能够仅仅通过看到2,就知道它有一个三键,但是我们还没学习如何做到这点，因此下面我们就开始进入一个新的主题,它将使我们能够有一定的认识,对于价电子的排布情况，包括可以对任何一个给定分子中的键是单键双键,还是三键作出判断。

麻省理工公开课 - 化学原理课程节选