There's no sense flogging a dead horse.
死马被鞭打是没有任何感觉的。
He's flogging a dead horse in trying to persuade people to use canals instead of roads.
他拼命地劝人不要使用公路而去使用运河，真是枉费口舌。
You're flogging a dead horse by asking Jim to lend you money-he hasn't even enough money for himself.
你要吉姆借钱给你，这简直是痴心妄想，他的钱甚到不够他自己花呢。
You're flogging a dead horse by asking Jim to lend you money-he hasn't even enough money for himself.
你要吉姆借钱给你，这简直是痴心妄想，他的钱甚到不够他自己花呢。
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