说一个人年轻不懂事，我们常说他/她是 young and inexperienced，即“少不更事，初出茅庐”等等，
我们也说这个人“还嫩点儿”，就是 wet behind the ears。
Wet behind the ears 的字面意思是“像刚生下来的婴儿一样，耳朵后的汗毛还是湿的”，引申为一个人“年轻，幼稚，没有经验”。
例如：
Attempt to do me in? You are still wet behind the ears.
想陷害我？你还嫩点儿。
这个片语也可以说成是“not dry behind the ears”，
例如：
Jane's not dry behind the ears yet.
简还是太年轻了。

let us study together~~~  come on ~~  

bump

very good

I never heard anyone using that expression before....~~ If I didin't read this thread,  I think I'll look at them blankly if they ever use it in front of me.

i see

传说中的俚语啊，谢谢分享  

no one actually say these things anymore
people just tend to say your not good enough or something like that

LOVELY

i see

Thank you for sharing