On hills, he must use low gears.

在山上，他必须用低速挡。

《柯林斯英汉双解大词典》

Children must use an approved child restraint or adult seat belt.

儿童必须使用经过认可的儿童安全带或成人座椅安全带。

《牛津词典》

On the test day, you must use the same ID to take the test.

考试当日，您必须使用同一张身份证件参加考试。

youdao

But he added that they must use the money to support services like police, fire, education and health care.

VOA: special.2009.01.09

Then, I use this sense I have of what the whole must be like to continue to read successive parts--lines, sentences, whatever they may be.

然后，我在对于全文设想的指导下,继续读剩下的部分，行，句，无论它可能是什么。

耶鲁公开课 - 文学理论导论课程节选

You can also use a "must" pattern when you're not talking about a person but you're talking about a situation.

当你不在谈论人物，而是在谈论情况的时候，你也可以用“must”句型。

Must 课堂 - SpeakingMax英语口语达人

The treaty, which has survived three wars, details exactly how each side must use cross-border rivers.

ECONOMIST: South Asia��s water

To determine CO2 levels before the introduction of modern stations, scientists must use so-called proxy measurements.

BBC: Carbon dioxide passes symbolic mark

For fraud communications to be effective, banks and card providers must use more innovative approaches.

FORBES: Enlisting Customers in Managing Cyber Fraud Risks