形容词
中文翻译：徒劳的
同义词：
['useless', 'futile', 'pointless', 'fruitless']
例句：
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1. The attempt to save the whale was a vain one.
试图拯救鲸鱼的努力是徒劳的。
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2. Her efforts were all in vain.
她的所有努力都是徒劳的。
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3. He spent his life pursuing dreams that were ultimately vain.
他一生都在追求最终注定是徒劳的梦想。