名词
中文翻译：循环
同义词：
['circulate', 'reflux', 'recirculate']
例句：
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1. Thewater in the lake is being recirculated through the system.
湖水正在通过系统进行再循环。
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2. The process of recirculating wastewater is essential for maintaining aclean environment.
废水再循环的过程对于保持清洁环境至关重要。
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3. The recirculation ofair helps to reduce the amount of pollutants in the atmosphere.
空气的再循环有助于减少大气中的污染物。