born yesterday
很天真或很愚蠢，没有经验
口语·形容某人幼稚或缺乏经验
英文释义
naive or gullible, lacking in experience or knowledge
例句
Don't think I was born yesterday; I know exactly what you're up to.
典故来源
源自日常比喻，刚出生的婴儿缺乏经验，形容人天真易骗。