opinion后面用in还是on（opinion是不是不可数名词）

后接on，中文意思是，对……的看法

例如

大家对这个问题都有自己的看法。Everyone had an opinion on the subject.

我们很想听听你对这个话题的看法。

We would be interested to hear your opinions on this subject.

他对这个问题的看法众所周知。

His opinions on the subject were well known.

opinion后面用on

例句

1.

I'd like a second opinion before I make a decision.

我在作决定之前，想听听别人的意见。

2.

Of course, this is just a personal opinion.

当然了，这只是个人意见。

3.

The media has a powerful influence on public opinion.

传媒对于舆论有很大的影响。