Don’t teach your grandmother to suck eggs. 別班門弄斧。
bān mén nòng fǔ
|英文解釋|| An older person is wiser and more
experienced and worldly than a young
person may think—thus, the older
person does not need to be taught.
|英文造句||I may be 70, but I’ve been using a
computer since before you were born!
Don’t teach your grandmother to
suck eggs, sonny!