名词
中文翻译：循环
同义词：
['circulation', 'reflux', 'recycle']
例句：
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1.The water in the lake is being recirculated through a network of pipes.
湖水正在通过管道网络进行循环。
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2. The company uses recycled materials to produce its products.
该公司使用回收材料生产产品。
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3. Recycling helps to reduce waste and conserve resources.
回收有助于减少浪费和节约资源。