put (yourself) in (someone's) place
to imagine that you are someone else and have to do what they do.
Now put yourself in the place of a policeman who is afraid and has to arrest a big guy with a knife.
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。