在发达国家，这是它们的第一生存需要。

In the developed countries it is their first survival requirement.

youdao

我已经存了一些钱以备不时之需，但在我们走之前，我可能需要多挣点钱。

I've got a little put-aside for a rainy day, but I might need to earn a little more before we go.

youdao

我们需要在冰柜里存满东西。

We need to stock up the freezer.

《牛津词典》

What is this? This is a wonderful piece of abstraction. It is saying, you don't need to know squat about what's inside the body of this function. You don't have to worry about the parameter names, because they're going to be preserved, you don't need to worry about how I'm doing it, this tells you how you can use this, in order to use it correctly. Of course, I can then close it off, and off we go.

但是这能告诉你一些信息,这是什么？,这是一段完美的抽象,它的意思是你不需要知道,这个函数的内部构造，你不必担心参数是否重名，因为它们已经被预存了,你不需要担心我如何使用它,它告诉了你你该如何操作，从而正确的使用它，当然我也可以把它关掉。

麻省理工公开课 - 计算机科学及编程导论课程节选

We need that there's another strategy of Player II that always does better.

即需要参与人II存永远占优的策略

耶鲁公开课 - 博弈论课程节选