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。
For example, one piece of code that runs in 10 seconds can optimized rather easily to run in less than a second.
例如，一段运行时间为10秒的代码很容易优化为在1秒内运行。
Kiss your partner and nibble one half of the piece of fruit while they nibble the other until it breaks in half, allowing the juice to run into your mouths.
吻你的伴侣，轻轻咬住这水果的一半，而对方咬住另一半，直到它断为两半。吻的时候让果汁流进你们的口中。
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？
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。
Unfortunately, we run into a difficulty here that is not uncommonly faced by etymologists, namely, that no one is precisely sure why this piece of humorous verse was so named.
不幸的是，我们碰到了一个词源学家经常碰到的难题，那就是，没有一个人能确定为什么这种幽默的诗歌这样命名。
Unfortunately, we run into a difficulty here that is not uncommonly faced by etymologists, namely, that no one is precisely sure why this piece of humorous verse was so named.
不幸的是，我们碰到了一个词源学家经常碰到的难题，那就是，没有一个人能确定为什么这种幽默的诗歌这样命名。
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