split-hair

I cannot split hairs on that burning query.

不能对那个严重的问题说长道。

I suppose you're splitting hairs.

为你在吹毛求疵。

I found it dull to split hairs over the privacy of a person who counted on one's card.

觉得对一个指望一举名的人的隐私评头论足索然无味。