名词
中文翻译：循环
同义词：
['circulate', 'recycle', 'cycle']
例句：
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1. The water in the lake is circulating around the island.
湖水在岛上循环流动。
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2. The recycling program helps to reduce waste and save resources.
回收计划有助于减少废物和节约资源。
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3. The cycle of life repeats itself every year.
生命循环每年重复一次。