That's a good idea, but it may not work.

这是个好主意，但它未必行得通。

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1.Don't be like that.别这样！2. It'll get you nowhere.你这样是行不通的。3.Don't you think it is dangerous to swim in that river? 你不认为在那条河里游泳不安全吗？4. Can I persuade you to believe it?我能不能说服您相信这一点？