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1. The doctor performed a thorough examination of the patient's circulatory system.
医生对患者的循环系统进行了彻底的检查。
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2. Blood circulation is essential for maintaining body temperature and supplying nutrients to cells.
血液循环对于维持体温和向细胞输送营养物质至关重要。
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3. During exercise, blood flow increases in the circulatory system to deliver oxygen and nutrients to muscles.
运动时，血液循环增加以将氧气和营养物质输送到肌肉。