We must follow traffic rules when crossing the street.

过马路时我们必须遵守交通规则。

youdao

For our safety, we must follow the traffic rules on the way to school.

为了我们的安全，我们在上学路上必须遵守交通规则。

youdao

To learn a language we must follow the principle of gradual improvement.

学习语言必须遵循循序渐进的原则。

《新英汉大辞典》

Well, that's right and of course we don't have any good reason to follow Plato when he says it must be the case that the soul exsited prior to birth.

这是正确的,而且我们没什么好的理由,跟随柏拉图的观点,即，灵魂存在于出生之前。

耶鲁公开课 - 死亡课程节选

We must follow the leads that we get, and we must pursue them until plots are disrupted.

CNN: Transcript: Obama outlines steps to prevent terrorism

We must follow the proper processes and make sure this case is dealt with in the proper way.

WHITEHOUSE: President Obama & Prime Minister Cameron Joint Press Availability | The White House

We must follow it not only when it is convenient, but when fear and danger beckon in a different direction.

FORBES: Justice, Dispensed with an Even Hand