However, when that gate is opened, the sodium channel is now going to be incredibly selective and only let through sodium ions and no other type of ion.

但是，当闸门打开的时候，钠离子通道,将会有极高的选择性,不允许除钠离子以外的任何其它离子通过。

麻省理工公开课 - 化学原理课程节选

And then upstairs in the warehouse, they have more selective pieces

仓库的楼上，是精选的商品，

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And all ion channels are selective for a single type of ion, and we can think about how that selectivity takes place, and that's where this idea of atomic radius is going to become very important.

所有的离子通道都是仅对某一种离子具有选择性的，而我们可以来想一想这种选择性是如何发生的，这也就是原子半径这个概念将会变得，非常重要的地方。

麻省理工公开课 - 化学原理课程节选

It's very selective. It's about the question of questions.

这是关于选择“问题中的问题“的。

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I'm a little bit more selective with that

我对角色比较挑剔。

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What it is is a selective exploration of the question of the questions.

而是对“问题中的问题“的选择性探索。

哈佛公开课 - 幸福课课程节选