1)waste one's breath,白費唇舌2)bite a file,白費力3)fish in the air,白費力4)plough the air,白費力5)plough the sand,白費力6)waste one's breath,白費口舌7)waste one's words,白費口舌8)lost cost,白費的成本9)a bad job,白費力的事10)A blind man will not thank you for a looking-glass.,秋波送盲，白費癡情。
用法和例句
it's no use talking to him, you'll only waste your breath.
