名词
中文翻译：循环
同义词：
['circulate', 'circulation', 'flow', 'movement', 'circulation system']
例句：
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1. Theblood in the body is constantly circulating.
体内的血液在不断循环。
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2.The river has a strong circulation of water.
这条河水流强劲。
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3. The heart's circulation is essential for life.
心脏的血液循环对生命至关重要。