So, that is just a quick example for some of you, you might be very familiar with ion channels, others might not know what these are, so I'll just tell you quite briefly that ion channels are these very massive transmembrane proteins.

这对你们中的某些人来说仅仅是个小例子，有些人可能已经非常熟悉离子通道这个概念了，但有些人可能还不清楚，那么就让我来简单地介绍一下离子通道,就是这些巨大的跨膜蛋白。

麻省理工公开课 - 化学原理课程节选

I really don't know at this point but uh, I don't know.

目前我还不清楚，还没有想好。

哥伦比亚大学的教程 - SpeakingMax英语口语达人

There are twenty actually I'm not sure there are twenty anymore.

那上面有二十家交易商,事实上，我不清楚还是否仍有二十家。

耶鲁公开课 - 金融市场课程节选