a black sheep 害群之馬
be old dog at something.就是對...有經(jīng)驗; 對...很內(nèi)行的意思.
goose egg【俚】零分
like a drowned rat 渾身濕透（象落湯雞）
like water off a duck's back 毫不在乎,毫無作用（如果你對侮辱、指責(zé)之類的不在乎可以用,如：Terry said he was too sensitive about criticism and he wanted to be like one of those people for whom it’s like water off a duck’s back）
to teach a fish how to swim 班門弄斧
a litte bird told me that 我聽說的；有人私下告訴我的（一般不愿說出來源時所用）
a white elephant無用的累贅東西；沉重的負(fù)擔(dān)
donkey's years 很長的時間
monkey uncle吃驚
rain dogs and cats傾盆大雨
a snake in the grass 潛伏的敵人,口蜜腹劍的人
monkey business胡鬧,騙人的把戲；欺騙；惡作劇