通常用作短语 in vain 。
例句： All her effort was in vain at last .
她所有的努力最后都白费了。

例句： All his father's exhortations were in vain .
他父亲的一切劝告都无效。
例句： 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。

We tried in vain to make him change his mind.

我们想让他改变主意，结果白费心机。

All our hard work was in vain.

我们一切的努力都是徒劳的。

※An old dog barks not in vain. 老犬不空吠。
※Money spent on the brain is never spent in vain. 智力投资，决非虚掷。
※Money spent on the brain is never spent in vain. (智力投资绝不会白花。)

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