One simple and (at least, in the movies) popular test to determine whether a diamond is real is to run it across a piece of glass.

确定钻石是真是假的一个简单而（至少在电影里）流行的测试是让它在一片玻璃上滚。

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Notice one last piece. If I'm going to do that, run through all possible answers, I still want to know, gee, what if there aren't any answers? How do I return that case?

注意最后一段，如果我要这样做，也就是运行所有可能的答案，我还是想知道要是没有结果呢？，在这个例子中应该返回什么呢？

youdao

These are not necessarily the parts that run the slowest; sometimes, a piece of code that is already quite efficient will be the one you want to focus on the most.

这些部分并不一定是运行得最慢的；有时，一段已经十分高效的代码可能将是您最想关注的部分。

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