6.PHRASE If you do something in vain, you do not succeed in achieving what you intend. 徒然

　　例：He stopped at the door, waiting in vain for her to acknowledge his presence.

　　他停在门口，徒然地等着她跟自己打招呼。

　　7.PHRASE If you say that something su ch as someones death, suffering, or effort was in vain, you mean that it was useless because it did not achieve anything. 无意义的

　　例：He wants the world to know his son did not die in vain.

　　他想让世人知道他儿子的死不是毫无意义的。

　　常见用法

　　用作形容词

　　She is vain and foolish, and yet people like her.

　　她自负而愚蠢，然而人们喜欢她。

　　She is vain of her voice.

　　她自以为她的声音了不起。

　　They endeavoured to make her happy but in vain.

　　他们尽量使她快乐，却徒劳无功。

　　All his fathers exhortations were in vain.

　　他父亲的一切劝告都无效。

　　We tried in vain to make him change his mind.

　　我们想使他改变主意，结果是白费心机。

　　The world had made him extravagant and vain.

　　世俗使他变得放荡不羁，虚荣自负。

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