「罪魁祸首」英文怎么说？

culprit

1. 犯人、罪犯、造成破坏的人

2. 问题的起因、罪魁祸首

Police hope the public will help them to find the culprits.

警方希望公众能协助他们抓到罪犯。

Children in this country are getting much too fat, and sugar and sweets are the main culprits.

该国儿童过于肥胖，糖和甜食是罪魁祸首。

The intro 

(Listening Comprehension)

Hey, how are you guys doing today ? It's Mr.Wong here, and boy, do I have some good news for you ! Remember the time I told you how 2 minors tried to break in my house ? Well, there was actually more than 2, I just didn't see the third guy. He was the main culprit, the "brains" of the operation as we would say. Yup, and they caught him. I think one of those kids spilled the beans. They adimitted the crime, so there's no need for me to appear in court，aww YEAH ! Isn't that great ? Alright, let's talk about today's word of the day which is "culprit". Check it out !

没看懂？请自己查字典！

（这才是真正的学习过程）