名词短语
中文翻译：空跑
同义词：
['futility', 'futile', 'pointless', 'fruitless例句：1. The empty running of the marathon was a waste of time and energy.（马拉松的空跑是浪费时间和能源。）2. The futile attempts to save the planet failed to make any difference.（试图拯救地球的努力都是徒劳的。）']
例句：
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1. The empty running of the marathon was a waste of time and energy.
马拉松的空跑是浪费时间和能源。
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2. The futile attempts to save the planet failed to make any difference.
试图拯救地球的努力都是徒劳的。
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3. His pointless question seemed to go unanswered by anyone around him.
他毫无意义的问题似乎没人能回答。