There's been a lot of work done on these over the years, but in fact, it's pretty hard to invent a good hash function. So my advice to you is, if you want to use something was a hash, go to a library. Look up a good hash function.

已经做过了很多的尝试和努力,但是事实是，很难发明出一个好的哈希函数,所以我给你们的建议是,如果你们想使用哈希功能,到函数库中查找一个好的哈希函数。

麻省理工公开课 - 计算机科学及编程导论课程节选

You use the "let's" pattern when you suggest to a friend, a colleague or to anybody that you do something a certain way.

当你在向朋友、同事或任何其他人提出建议，希望大家以某种方式做某事的时候，你可以使用“let's”句型。

Let's 课堂 - SpeakingMax英语口语达人

Another way to use the "What if" question is to ask for advice.

另一种使用 “What if”问句的情况是征求建议的时候。

What if 课堂 - SpeakingMax英语口语达人