名词
中文翻译：循环
同义词：
['circulate', 'flow', 'circulation']
例句：
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1.The blood in the body is constantly circulating through the veins and arteries.
体内的血液不断地通过静脉和动脉循环。
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2.The oil circulates through the pipes to power the machinery.
油通过管道流动来为机器提供动力。
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3. The water in the lake circulates around the island, providing fresh water for the plants.
湖泊中的水在岛屿周围循环，为植物提供新鲜水源。