这项条约规定，到本世纪末，美国必须撤走其基地。

The treaty provides that, by the end of the century, the United States must have removed its bases.

《柯林斯英汉双解大词典》

他坚持美国必须量入为出。

He insisted that America had to live within its means.

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美国必须首先与欧洲就启动对话达成协议。

First, the us must deal with Europe to begin talks.

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One is if you have to coordinate how you're going to give this vaccine to two million children across the U.S.

首先必须协调合作,如何才能将疫苗,分发给全美国二百万孩子

耶鲁公开课 - 生物医学工程探索课程节选

The only university requirement is, or that I have to take is American Cultures.

学校规定必须选的是美国文化。

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Especially in the United States, it's a law that you have to wear your seatbelt.

尤其在美国，法律规定开车时必须系好安全带。

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