谦虚的反对

Correct me if I'm wrong, but isn't [a different topic]...?

如果我说错了，请你们指正，不过是不是...？

I'm not an expert on..., it seems to me that...

我在这方面是外行，在我看来...

I might be wrong, but ...

可能我理解错了，不过...

I suspect that I lack some information about this aspect, but here is my two cents.

可能我对这方面的信息了解不够充分，我的看法是...

I am not sure about this..., you might want to check with Professor X... Would you mind letting me know what he/she says?

这个我不太确定，或许你可以找XX教授确认一下。到时候麻烦你告诉我一下他是怎么说的，可以吗？

This is one way to look at it. Another way to look at it might be....

你这是一种看法，我另外还有一种看法是...（这句话通常在别人说了一堆之后，为了引出自己的观点时使用）