名词
中文翻译：Unknown
同义词：
['circulate', 'circulation', 'flow', 'circulation system']
例句：
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1. The blood circulates through the body to deliver oxygen and nutrients to cells.
血液通过身体流动，为细胞输送氧气和营养物质。
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2. The heart's circulation is essential for maintaining a healthy heart.
心脏的循环对保持健康的心脏至关重要。
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3. The water in the ocean has a constant circulation that keeps it fresh.
海洋中的水有持续的循环，使其保持新鲜。