grandmother
don't teach your grar}dmather to suck eggs
用：当别人试图告诉你如何做某事，而你早就知道该如何做时说这句话。
意：别班门弄斧
例，Don't teach your grandmother to SUCk eggs, young cnan? I've been goingcamping in this area for 20 years!
年轻人。就凭你那点本事还想教我?我在这个地区搞野营都搞了20年了!
A: Bill, don't drive sn fast?
比尔，车别开这么快!
I've been driving a car for 30 years, sn don't try to teach your grandmother to suck eggs.
我开了30年的车，用不着你来指点!
