FIFA,international soccer's governing body, allows a player to represent only one nation at the senior level.

VOA: standard.2010.06.09

For these purposes think about a channel, it only allows sodium to go through for example.

基于此目的,我们来讲离子通道,拿仅允许钠离子通过的通道作为例子

耶鲁公开课 - 生物医学工程探索课程节选

And it's her only her humility, the sense of not being able to, that allows her space to be able to do what is proposed to her by the angel Gabriel.

但最终是她的谦卑，对自己,能力有限的认知，才使得,她接受天使加百列的提议。

普林斯顿公开课 - 人性课程节选

Saying the United States is the only advanced democracy and only wealthy nation that allows such hardships for millions of its people, the president said the time has come to put politics aside and solve the problem.

VOA: standard.2009.09.10

Just like u, we'd like to be able to express it in a way that allows us to calculate what happens only from equation of state data.

就像内能u一样，我们希望能够利用状态方程的数据,计算出其表达式,这些表达式能方便我们说出即将发生的过程。

麻省理工公开课 - 热力学与动力学课程节选