At least one of the two must be available.

两者至少要有一个可用。

youdao

By the pigeonhole principle, at least two must be of the same color.

由鸽子洞原理，至少有2只有相同的颜色。

youdao

One party must be free-riding directly on another's expenditure, and the two must be in direct competition.

一方必须是直接搭乘另一方花费的便车，并且双方须是直接竞争关系。

youdao

They have less than two weeks to go before they must perform the play for the Shakespeare in the Courts program.

VOA: special.2010.06.03

And that the fact that it split into two was telling them that there must be some new property to the electron, and what we call that now is either being spin up or spin down.

它能一分为二的,事实告诉我们,电子一定有某种新的性质，我们叫它自旋向上或者自旋向下。

麻省理工公开课 - 化学原理课程节选

If two object are in the same temperature, and two other object are in the same temperature, then all three must have the same temperature.

如果有两个物体的温度相同，又有另外两个物体的温度相同，那么这三个物体一定有同样的温度。

麻省理工公开课 - 热力学与动力学课程节选

The competition authority said the two must ensure the independence of the LSE's clearing services, LCH.

BBC: NEWS | Business | LSE seeks end to bid speculation

But there are only two must-watch comedies on TV now that "30 Rock" is over.

NPR: A Grim Outlook For Sitcoms Post-'30 Rock'

It is too blithe to assume that the two must go together.

ECONOMIST: Bagehot