名词
中文翻译：静脉
同义词：
['vein', "artery例句：1. The doctor examined the patient's circulatory system.（医生检查了患者的循环系统。）"]
例句：
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1. The doctor examined the patient's circulatory system.
医生检查了患者的循环系统。
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2. Blood circulation is essential for life.
血液循环对生命至关重要。
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3. The heart's role in blood circulation cannot be overstated.
心脏在血液循环中的作用不容忽视。