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adj.徒劳的；自负的；无结果的；无用的
1、Jain───n.印度耆那JiaoTu；adj.耆那JiaoTu的；耆那教的；n.（印、美、英、加、澳）然（人名）
2、vains───虚荣
3、ain───adj.自己的；n.(Ain)（马、美、英）艾因（人名）
4、Wain───n.运货马车；北斗七星；n.(Wain)人名；(英)韦恩
5、fain───adj.愿意的；强迫的；adv.乐意地，欣然地；n.(Fain)（美）法因（人名）
6、Cain───n.凶手；杀兄弟者；该隐（亚当之子）
7、gain───n.增加；利润；收获；vt.获得；增加；赚到；vi.增加；获利；n.(Gain)人名；(英、匈、法)盖恩
8、Main───adj.主要的，最大的，最重要的；n.（输送水、煤气等的）总管道，主管道；(themains)（水、电等的）供应，供应XiTong；电源插座；海洋，公海；主帆（mailsail的简称）；（掷骰子游戏中）叫数；斗鸡比赛；n.(Main)（美）梅因（人名）
9、hain───海恩（地名）
1、He was vain and bombastic.───他既虚荣又浮夸。
2、I think he is shallow, vain and untrustworthy.───我认为他浅薄、虚荣、不可信。
3、For if he had not hoped that they that were slain should rise again, it would have seemed superfluous and vain to pray for the dead.───如果他不希望那些死过的人还要复活，为亡者祈祷，便是一种多馀而糊涂的事。
4、A tight noseband is a vain attempt to disguise the fact that your horse is not ready for the things you are asking him to do.───紧的鼻革是徒劳的掩饰，它只能说明你的马没有准备好去做你要求他做的事情。
5、Now grown up, for you; I am strong, and for you; I changed for you. I know it is all in vain!───现在长大了，为你；我坚强了，为你；我改变着，为你。只是我知道这一切都是徒然！
6、He was self-important, vain and ignorant.───他自大、虚荣、而且无知。
7、An attempt to preserve life in a state of neutrality and indifference, is unreasonable and vain.───试图保持生活的中立和淡漠，是不明智的，徒劳的。
8、He asked her again in the vain hope that he could persuade her to come(= it was impossible).───他又问了她一次，徒然指望着能说服她来。
9、All our efforts to persuade the old man to leave the dangerous house were in vain.───我们极力劝说那位老人离开那栋危房，老人就是不听。
1、An old dog barks not in vain.
2、She's very vain about her good looks.
3、They sought in vain for somewhere to shelter.
4、I tried in vain to start a conversation.
5、Parents campaigned in vain for her reinstatement.
6、’Tis altogether vain to learn wisdom and yet live foolishly.
7、We searched in vain for the missing child.
8、She's just a vain, foolish woman.
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