图书管理员问这些书是不是你的。

The librarian asked if those books are yours.

youdao

它们可以告诉你是否有东西在移动，但不能肯定那是不是一个人，或者是不是你的孩子——它们看不出区别，所以会一直警告你。

They can tell you if something is moving but they don't necessarily know if it's a human being or if it's your kids — they don't know the difference, so they will warn you all the time.

youdao

想知道他是不是你命中注定的那一位？

Want to know if he's the one?

youdao

And the first thing you do is ask is it an instance of some problem that other people have already solved?

而且你以前从没碰过这个问题,你首先要做的一件事就是问问自己,这是不是一个别人已经解决了的问题？

麻省理工公开课 - 计算机科学及编程导论课程节选

It depends on like, depends a little bit on like if you have time to take a class or so.

这要看，这有点要看你是不是有时间上课。

开放式的课程？ - SpeakingMax英语口语达人

So, that's a homogeneous system, one phase. You have to know if your system is an equilibrium system or not.

所以这是个均匀系统，只有一个相，你得知道你的系统,是不是个平衡系统。

麻省理工公开课 - 热力学与动力学课程节选