It must have happened at about five o'clock in the morning.

这件事一定发生在凌晨五点钟左右。

《牛津词典》

Heidi, knowing that something must have happened, followed him.

海蒂知道一定是发生了什么事，就跟着他。

youdao

Something bad must have happened.

肯定发生了什么不好的事。

youdao

That's so basic, it must have happened a million times and that's the basic idea of the stock market.

这是很基础的概念,早已屡见不鲜,而这就是股票市场的最初思想

耶鲁公开课 - 金融市场课程节选

Suppose you are starting a business with somebody-- it could be at any time in history-- Babylonia or something--this must have happened.

假设你要和某人一起做一笔生意...,可以在任何一个时代...,例如古巴比伦或者其他时代...肯定发生过这种事

耶鲁公开课 - 金融市场课程节选

Well it happened because we clearly must have a faulty assumption This can't possibly be true.

是因为做了,一个错误的,这不可能是真的。

麻省理工公开课 - 热力学与动力学课程节选

So something must have happened to make transfers to 501(c)(4) organizations an enforcement target.

FORBES: IRS Drops Investigation Into Contributions (Tax World Drops Jaw)

In addition, "having some access to water must have happened here, " he noted.

CNN: Gupta: How could woman survive 16 days in rubble?

It must have happened logically during times of peace and prosperity.

FORBES: Move up http://i.forbesimg.com t Move down