a greenhorn不懂事的小伙子
green在此处代表“年轻”（young）的意思，greenhorn 是指“新的犄角“，因此可以引申为”刚开始长犄角、蹦蹦跳跳的小牛“，再引申为”一个不懂事的小伙子“。此外，greenhorn 还有容易受骗(gullible)的涵义。至于老成世故(sophisticated)年轻人，英文里则称之为a man/woman of the world或是men/women of the world,也就是“这个世界的人”。
★ Paul is very much a man of the world.
保罗是个很懂世故的人。
★ Compared with him, you are an utter greenhorn.
跟他相比之下，你简直什么事都不懂。
The man in the street一般市民
在街上随处可见的人，英文里称之为the man in the street，亦即“一般市民（ordinary citizens）。其中有些人可能缺乏主见，只会随着旁人的意思行动，‘无足轻重“，就如漂浮水面的稻草般，因而被称之为a straw man.
★ After the election, the man in the street will have no choice but to trust the elected politicians to look after his interests.
选举之后，一般民众没有别的选择，只能委托他们选出的政客来看顾自身的利益。
★ The lawmakers are so well paid that nowadays even a straw man would like to think of having a try in the election.
因为立法者的待遇太好了，连草包都想出来竞选。
