split hairs
過于計較
A:My mother likes to split hairs.
A:我媽媽太過于計較了。
B:What do you mean by that?
B:你這話是什么意思?
A:She's keen to buy something which is much cheaper.
A:她喜歡買更便宜的東西。
B:Mothers are like that.
B:母親都是這樣。