you could characterize them in terms of how they're gated, -- and basically how they open or close -- that's one way to talk about different types.

你可以通过闸门的类型来描述它们，这基本上也就是看它们是如何打开或关闭的-,这是一种讨论不同类型的方法。

麻省理工公开课 - 化学原理课程节选

It has a gate on it and that gate is in open or close state depending on whether a ligand is present or not.

在这个通道上有个门,这个门是打开还是关闭,取决于配体到来与否

耶鲁公开课 - 生物医学工程探索课程节选