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- 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.
- 老师发现他是在白费口舌；孩子们根本不相信他。
The teacher saw that he was wasting his breath; the children refused to believe him.
- 他们听不进去，不必和他们白费唇舌了。
They won't listen, so don't waste your breath telling them.
- 我们全部的努力都白费了。
All our efforts were wasted.
- 他的所有努力都白费了。
All his efforts were wasted.
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