A perpetrator is the person who carries out something morally wrong or illegal — the one who did the deed, not the one who suffered it. In talking about crime or harm, perpetrator sits opposite victim.

A perpetrator is the personPerpetrator指的是這種人： who carries out something morally wrong or illegal做出不道德或違法事情的人， the one who did the deed, not the one who suffered it是做這件事的人，不是受害的人。 In talking about crime or harm談到犯罪或傷害時， perpetrator sits opposite victimperpetrator跟victim（受害者）是相對的。

It is a formal word: news, police, and school essays use it; friends at lunch usually say the person who did it. Careful English often says alleged perpetrator until a court decides, because the word already sounds sure of guilt.

It is a formal word這是個正式的字： news, police, and school essays use it新聞、警方、學校作文都會用； friends at lunch usually say the person who did it朋友吃午餐聊天通常只會說「做這件事的人」。 Careful English often says alleged perpetrator until a court decides謹慎的英文在法院判決之前常會說alleged perpetrator（涉嫌加害人）， because the word already sounds sure of guilt因為這個字聽起來已經很肯定對方有罪。

Police slang shortens it to perp, mostly in American shows. It is stronger than suspect (someone police are looking at) and more exact than criminal (which can mean a life of crime, not this one act).

Police slang shortens it to perp警方的俚語把它縮短成perp， mostly in American shows大多出現在美國影集裡。 It is stronger than suspect (someone police are looking at)它的語氣比suspect（警方在調查的對象）更強烈， and more exact than criminal (which can mean a life of crime, not this one act)也比criminal（可能指一輩子的犯罪生涯，不是這一件事）更精確。