Wow, OK, maybe not so wow, but this is now constant. This is constant time access. So I can do searching in constant time which is great.

喔，当然，可能没那么,但是现在是常数级了,这是常数时间的访问。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's instead outside of them and, by convention, at the top of the file so that I can access it anywhere, whether or not this is a good thing, remains to be seen.

它在函数的外面，按照惯例，在文件的顶端，所以我可以在任何地方使用它,不管这是不是好事情，拭目以待。

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