乳臭未干

Traditional (Taiwan): 乳臭未乾

rǔxiùwèigān ㄖㄨˇ ㄒㄧㄡˋ ㄨㄟˋ ㄍㄢ

    • lit. smell of breast milk not yet dried (idiom)
    • fig. immature and inexperienced still wet behind the ears

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Sources