1. All our efforts were vain.
    我们的一切努力都归枉然。

2. At lunch he spoke impolitely (不礼貌地) to his father, spilled his baby sister's milk, and remarked that his teacher said we were not to take the name of the Lord in vain(滥用上帝的名义).
    吃午饭时, 他对他爸爸说话很不礼貌，把还是婴儿的妹妹的牛奶打翻了，还说他的老师讲过，我们不可以白白使用上帝的名字。

3. People are amazed at your "insight" because most are so vain (爱虚荣的) they can't imagine how much they have in common with the rest of the population.
    他们会惊讶于你的"洞察力"，因为多数人太爱虚荣，以至想像不到自己实际和其他人一样平庸。

4. Recently I operated in vain on an eighty -year-old woman with cancer of the liver ...
    最近，我给一位80岁的患肝癌的妇女动过手术，但没有成效。

5. In vain they rush frantically round from place to place, trying to escape from avenging boredom by mere clatter and motion.
    他们到处奔乱跑，企图以闲聊和乱窜来摆脱无聊对他们的报复，

6. In vain; then even the monsters we defy
    甚至连那些我们所不齿的魔类，