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- 想让他改变主意，好像就是以头撞墙，枉费心机。
It is like banging your head against a brick wall to try to make him change his mind.
- 他企图诱使她离开丈夫和家庭，结果是枉费心机。
He tried in vain to lure her away from husband and home.
- 他拼命地劝人不要使用公路而去使用运河，真是枉费口舌。
He's flogging a dead horse in trying to persuade people to use canals instead of roads.
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