Though he was not dry behind the ears, he had to make a living by himself.

他虽未成年, 但得自己谋生.

《简明英汉词典》

John had just left school, and was not dry behind the ears.

约翰刚刚步出校门, 还有些乳臭未干.

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He's not dry behind the ears yet he still doesn't know the basic functions.

他并非毫无经验,但他依然不知道基本职责.

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