短语 | flog a dead horse |
释义 | flog a dead horse waste energy on a lost cause or unalterable situation 作无用功, 徒劳无益。 ˌflog a dead ˈhorse(BrE) (informal)to waste your effort by trying to do sth that is no longer possible鞭策死马;做徒劳无益的事 |
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