be too young and unable to understand how people should behave;be still wet behind the ears;green;inexperienced and easily fooled ;

When he wet behind the ears. he thought that life was just a bowl of cherries.
他年轻时, 少不更事,以为人生不过是一盘樱桃.
来源:互联网摘选Back in my salad days my friends and I used to go dancing every Saturday night.
回想我那时,年少不更事,每个周六的晚上都和朋友们去跳舞.
来源:《简明英汉词典》Service of this hotel is friendly although waitresses seem a bit wet behind the ears.
虽然这家饭店的服务生看上去少不更事,但是它的服务还是不错的.
来源:互联网摘选
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