名词
中文翻译：循环
同义词：
['circulate', 'circulation', 'flow', 'circulation system']
例句：
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1. The bloodin the body is constantly circulating to keep it healthy.
体内的血液不断循环以保持健康。
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2. The river has a strong circulation that helps to nourish the land.
这条河流有强大的循环系统，有助于滋养土地。
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3. The new model car has a more efficient circulation system than its predecessor.
新款汽车的循环系统比前一代更加高效。