bang one's head against a brick wall

head的意... ... a head of lettuce 一个莴苣头 bang one's head against a brick wall 徒劳无功 bite sb.'s head off 凌厉地回答 ...

bang on是什么意思... ... bang on 正合适,正好,好极了,太好了 bang one's head against a brick wall 硬着头皮去做,鸡蛋碰石头 ...