基本解釋徒勞無(wú)功;枉費(fèi)心機(jī)英漢例句雙語(yǔ)例句It is useless to flog a dead horse.鞭打死馬,徒勞無(wú)益。dict.cnIt is useless to flog a dead horse.鞭死馬無(wú)益;勿舊調(diào)重彈。edu.sina.com.cnto flog a dead horse更多例句