副词
中文翻译：无用地
同义词：
['useless', 'futile', 'pointlessly']
例句：
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1.He spent hours trying to fix the car without success.
他花了几个小时试图修车，但没有成功。
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2. The plan was useless because it didn't take into account any possible obstacles.
这个计划是无用的，因为它没有考虑到任何可能的障碍。
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3.Her efforts were pointless; she had no idea how to solve the problem.
她的尝试是徒劳的；她不知道如何解决这个问题。