◎ 知底 zhīdǐ
[know the inside story] 知道底細或內(nèi)情
知根知底

1.know the inside story; be in the know

知道底細?！秲号⑿蹅鳌返谑呕兀骸笆钦h這報仇的話，我不知底，沒提明白；敢則人家全比咱們知底?！?/p>