如果我错过了火车，这没什么关系。

It doesn't matter if I miss my train.

youdao

教授：好，如果我错过了火车，我就会迟到。

Prof: good. So If I miss my train I'll be late.

youdao

如果我错过其中一个，我突然就会变得紧张。

Who knows, if I miss one , all of a sudden I get nervous.

youdao

So, if you by chance, I know it's very rare, but if by chance you don't get the class you can always follow up later.

如果你们偶然，我知道不太可能，但是如果不小心你们错过了某节课,你们就可以在之后补回来了。

麻省理工公开课 - 固态化学导论课程节选