nitpicker

I hate to sound like a nitpicker , but I found a comma missing in your third paragraph.

我很讨厌听起来好像是在挑剔。但是我发现你文章的第三段里少了一个逗号！

A nitpicker who obsesses over each dime is too tense to live with market risks.

对每一分钱都斤斤计较的人，由于过分敏感，无法承受市场风险。

The nitpicker who criticizes her is her best friend Laura.

唯一批评她的是她的好朋友劳拉。