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