动词
中文翻译：Unknown
同义词：
['白费，白做，白说，空谈例句：1. He tried to save the money', 'but it was all for nothing.（他试图节省钱，但都白费了。）']
例句：
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1. He tried to save the money, but it was all for nothing.
他试图节省钱，但都白费了。
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2. She spent all her time on useless hobbies.
她花所有的时间在无用的爱好上。
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3. The talk was all in vain;there was no solution to the problem.
这次谈话都是徒劳的，没有解决任何问题。