All right? The first one is, that test has to involve-- shouldn't have to, the value of some variable.

好不好？第一件事是，循环开始的测试必须必须-不是一定，一些变量的值。

麻省理工公开课 - 计算机科学及编程导论课程节选

Let's say they're telling you, you have to do something, you have to do something.

假设他们告诉你，你必须去做某事，一定得做某事。

The thing is 课堂 - SpeakingMax英语口语达人

So, empathy, caring, sympathy don't kick in, but instead there's the aggression unleashed at somebody and there has to be some level of surprise.

所以移情，关怀，同情没有发挥作用，反而是释放了别人的侵略情绪,还必须在一定程度上出人意料。

耶鲁公开课 - 心理学导论课程节选

They have to be forced apart to a certain degree.

它们必须在一定程度上被分开。

耶鲁公开课 - 文学理论导论课程节选

It's - a suture or a stitch has to hold the wound closed so it has to have certain mechanical strength and imagine the problem of making something that's dissolvable so it disappears but also is strong enough to hold a wound closed reliably for a length of time.

能够拉紧切口的缝合线,就必须具有一定的机械张力,大家想像一下制造这种缝合线的难度,身体组织不仅要能吸收这种缝合线,而且这种线必须有足够的张力,一定时间内能够拉紧切口

耶鲁公开课 - 生物医学工程探索课程节选