出于同样的原因，防风窖必须有一个通风口。

For the same reason, tornado cellars must have an air opening.

youdao

只能汤姆或者蒂姆和你一起去，因为他们必须有一个留在家里。

Either Tom or Tim is going with you because one of them must stay at home.

youdao

它还必须有一个对每个人都公平的利润和薪酬结构。

It must also be done with a profit and remuneration structure that is fair to everyone.

youdao

Right. You really have to have a wise passiveness that moment to really think that every piece of art have that kind of duty behind it.

的确，一个人必须要有这种聪悟的被动,才能在那一瞬间理解到每一个艺术作品,背后都有这个的意义。

普林斯顿公开课 - 人性课程节选

So the other possible deviation we have to consider, is a deviation of the form of one of these guys dropping out.

那么另外一个我们必须要考虑的偏差,是她们俩有一个人退出选举

耶鲁公开课 - 博弈论课程节选

Every force, with one exception, can be seen as a force due to direct contact with the body.

除了一个例外,其它所有力必须要和物体有直接接触

耶鲁公开课 - 基础物理课程节选