以下为句子列表：
英文: He's flogging a dead horse in trying to persuade people to use canals instead of roads.
中文: 他拼命地劝人不要使用公路而去使用运河，真是枉费口舌。
更详细...
英文: You are beating a dead horse if you are trying to make him change his political views.
中文: 你要想改变他的政治观点，那是徒劳无益的。
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