But just to point out the confusion can be we've actually switched what the question is here.

他们有这些幻灯片的拷贝,这里要指出容易混淆的地方是。

麻省理工公开课 - 化学原理课程节选

And five weeks less one day later I decided you know what this might actually be for me and I switched from pass-fail to letter graded status at that point in time.

而第五周的最后一天,我从上及格-不及格制的课程转为上数字学分制的课程,你们可能知道这对我来说意味着什么。

哈佛公开课 - 计算机科学课程节选

Some proteins can be switched from an 'off' position where they don't do anything to an 'on' position where they now do something by only a chemical reaction like this where a phosphorous is added.

一些蛋白质可以从关闭状态的,无所作为,到成为开启状态后,执行某种功能,中间只发生了一个引入磷酸基的化学反应

耶鲁公开课 - 生物医学工程探索课程节选