If you're lucky, the function's man page lists all of its possible return values and what they mean in the context of this particular function.

如果运气好的话，函数的手册页会列出其可能返回的所有值，以及它们在此特定函数的上下文中所指的含义。

youdao

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

If it is possible to return the data to the client without serialization, by binding directly to an XML output host variable, this is the safest way to avoid any kind of substitution character.

如果可以在不串行化的情况下将数据返回到客户机，那么，通过直接绑定到一个XML输出主机变量，这是避免任何替换字符的最安全的方法。

youdao

This would be good luck if you were long and now suddenly you got a huge return that you would not have thought was possible since you've never seen it before.

如果你长期持有这份投资,你就走运了,回报如此之高,你自己都没有料到,可能你也从来没有见过这种情况

耶鲁公开课 - 金融市场课程节选

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