成语 wet behind the ears 直译是“耳朵后面还是潮湿的”，它的真正含义是“乳臭未干、初出茅庐”，形容年轻人“少不更事，缺乏经验”。据说这个成语源于胎生动物，如牛、羊刚生下来的时候全身湿漉漉的;虽然它们的身体很快就干了，但是耳朵背后却还是湿的。

例句

①Pikachu has just left school and is still wet behind the ears.

皮卡丘刚从学校毕业，还没什么社会经验呢。

②Sarah knows the theory of the job, but when it comes to practical experience, she’s still wet behind the ears.

莎拉理论上知道这份工作该怎么干，但要付诸实践时，她可没有什么经验可谈。

③The committee took no notice of what Peter said; obviously they thought he was still wet behind the ears.

委员会对彼得说的话不屑一顾，显然他们认为他缺少经验。