Surely they must have a description.

他们肯定有一个说明。

youdao

You must have a Jack O'Lantern on Halloween.

万圣节前夕，你必须要有一盏“杰克灯”。

youdao

They must have a definite replay, yes or no.

他们必须得到一个要么是要么非的明确回答。

《新英汉大辞典》

Continuing disasters in the Indian Ocean made Indonesia decide it must have a warning system of its own.

VOA: special.2009.03.17

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

Must have a see. What else is there... There's a lot of nice parks to visit.

一定要去看看。还有什么……还有很多漂亮的公园。

旧金山的景点 - SpeakingMax英语口语达人

But for streaming content, Netflix must have a contract in place on an ongoing basis.

FORBES

She must have a robust constitution, he thought, immune to colds and despair, unsentimentally surviving.

NEWYORKER: The Valetudinarian

The argument that Parliament has become ineffectual must have a hollow ring to government ministers.

ECONOMIST: Bagehot