He must be a crab!

他一定是一只螃蟹！

youdao

"He must be a strong boy and a steady boy," he said.

“那他必须是个强壮又可靠的男孩才行。”他说。

youdao

He must be a newcomer to town and he obviously didn't understand our local customs.

他肯定是新到小城，显然不了解我们当地习俗。

《柯林斯英汉双解大词典》

But he says there must be a "clear timetable" for talks about protecting their security without threatening other people's security.

VOA: special.2009.05.23

This is why he tells us parenthetically that marriage must not be called a defilement.

这就是为什么他顺便地告诉我们,婚姻不能被称为肮脏。

耶鲁公开课 - 弥尔顿课程节选

He reasoned then that the charge, since he could vary voltage continuously but got a discontinuous variation in velocity, his conclusion was that the charge must be discontinuously attached to the droplet.

他推断出电荷，因为他可以不断地改变电压,但是得出了速度是在不连续变化着，他的结论是电荷,是间断地依附于液滴上的。

麻省理工公开课 - 固态化学导论课程节选

He must be a complete man and a common man and yet an unusual man.

FORBES: Robert B. Parker

Ramsey showed he must be a fixture in the senior Wales side from now on with an impressive display against a powerful and experienced German side.

BBC: Wales 0-2 Germany

It quickly became clear that he must be a former tennis pro, and I waded over to my wife to tell her that we were staying in the same hotel as Mark Philippoussis.

BBC: Just the Tomic