1. Expression：bad egg

Explanation：A dishonest or ill-behaved person. （坏人）

Example：We could tell he was a bad egg even at a young age.

很小的时候，我们就知道他是个坏蛋。

He's been in prison several times for all sorts of crimes. He's a bad egg.

他因各种罪行入狱多次，他是个坏蛋。

We are so worried for our daughter has made friends with a bad egg.

我们很担忧，我们的女儿交上一个不三不四的朋友。

That bad egg was recognized by policemen although he disguised himself well.

那个坏蛋尽管伪装得很好, 还是被警察认出来了。

Wherever he goes, he makes trouble—he is a sheer bad egg.

无论到哪，他总要闹事，他是个十足的坏蛋。

2. Expression：good egg

Explanation：Someone who is known to be trustworthy and kind. （好人）

Example：Joey's a good egg. He always makes time to help others in need.

乔伊是个好人——他总是抽出时间帮助危难中的人。

He seems like a good egg. I'll take a chance on him.

他看起来是个好人，我来试试他。

He used to play the roles of bad eggs but this time a good egg.

他以前一般都扮演反面角色，这次却演了一个正面角色。

He had been deceived into thinking that she was a good egg.

他被她欺骗了，认为她是一个好人。

3. Expression：egghead

Explanation：A derogatory term for an intelligent, studious person. （书呆子，受过高等教育的人，知识分子）

Example：How did that egghead get elected to the homecoming court over me?

那个书呆子怎么会选上返校节法庭，而不是我呢？

I'm worried that people will think I'm an egghead because I won so many academic awards.

我很担心人们会认为我是个书呆子，因为我获得了那么多的学术奖项。

The eggheads aren’t exactly taking over the world.

知识分子并不能完全掌控世界。

I have to tell you that since he went off to college, Bill has turned into a real egghead.

我得告诉你比尔上了大学后，他真是变成了一个书生气十足的人。