hurry back and forth for nothing; make a futile journey ? 你去求他幫忙？恐怕你會(huì)～。Are you going to ask him for help? I’m afraid you’ll make a futile journey.
徒勞往返tú láo wǎnɡ fǎn
徒勞：白費(fèi)力氣；往：來(lái)；返：回。形容辛辛苦苦地跑來(lái)跑去，沒(méi)有效果。make a futile journey, hurry back and forth for nothing, make a vain trip