动词短语
中文翻译：无意义地
同义词：
['in vain', 'futilely']
例句：
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1.The attempt to save the city was in vain.
试图拯救城市的尝试是徒劳的。
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2. His efforts were futile; there was no hope for success.
他的努力是徒劳的；没有成功的希望。
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3. The project was a waste of time and resources; it was futile.
这个项目是浪费时间和资源；它是徒劳的。