习语：a private eye
讲解：a private eye 是美国俚语，相当于a private detective 指“私家侦探”。
支持范例：
The only way he could find out if they were having an affair would be to hire a private eye.
他能查出他们之间是否有暧昧关系的唯一办法就是雇个私人侦探。
英语情景对话：
A: What’s his job?
他是做什么的？
B: He used to be a policeman.
他过去是当警察的。
A: But Mrs. Smith hired him to find her lost son.
可史密斯太太雇用他寻找失散的儿子。
B: Yeah. He's a private eye now.
没错，他现在是私家侦探了。
英语学习笔记：
used to do sth：过去常常做某事
lost son：失散的儿子
