Go through something with a fine-tooth comb:
To examine something very closely.
“Go through something with a fine-tooth comb” 或 “go over something with a fine-tooth comb（用细齿梳子仔细梳理某物）” 的意思是 “仔细检查、查看或彻底搜查某物”。
这个表达来源于治疗虱子时，人们用间隙密集的细齿梳子 “a fine-tooth comb” 刮虱子的做法。
例句
Lisa’s work is always perfect and without any mistakes. She goes over every assignment with a fine-tooth comb before submitting it.
丽莎的工作总是完美无缺，没有任何错误。她每次交作业前都会仔仔细细地检查一遍。
Our teacher told us we should go over last week’s chemistry notes with a fine-tooth comb before our next test. I think he was giving us a hint!
我们老师告诉我们，在下次考试前，应该仔细地复习上周化学课的笔记。我觉得他这是在给我们一个提示！
The police officers went through the crime scene with a fine-tooth comb looking for evidence.
警察彻底搜查了犯罪现场，寻找证据。
