我的感冒想必是你传染的。

I think I must have caught this cold from you.

《牛津词典》

一个年轻人看到日落，由于无法理解和表达日落在他心中唤起的激情，便得出结论：落日处想必是通往遥远世界的大门。

A young man sees a sunset and, unable to understand or to express the emotion that it rouses in him, concludes that it must be the gateway to a world that lies beyond.

youdao

我从逻辑推理方面解释不了他讲的这番话，他想必是神经错乱了。

I can't explain such a statement by him on the basis of logic. He must have blown his top.

《新英汉大辞典》

The thing that we have seen him doing is charging more, but I guess we've got to allow that.

而我们看到的是报纸涨价,但是我想必接受这些

耶鲁公开课 - 金融市场课程节选

They think, it doesn't matter what I do, I'm going to get the same consumption as everybody else, so I'll just get lazy-- a very fundamental problem, which you probably are already aware of.

因为他们知道，无论做了什么，都会享受与其他人相同的消费水平，所以偷懒就行了-,想必你们都已经意识到了，道德风险在这里是极其重要的问题。

耶鲁公开课 - 金融市场课程节选

It's the sort of thing that we can put on a scale and prod with a stick and the biologists can study, presumably made up of various kinds of molecules, atoms and so forth. So we've got the body.

这是一种我们可以称重,可被棍打,可被生物学家研究的东西,想必是由不计其数的分子,原子等构成,于是我们有了肉体

耶鲁公开课 - 死亡课程节选