名词
中文翻译：Unknown
同义词：
['veins', 'arteries', 'capillaries', 'veins', 'vessels']
例句：
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1. Thedoctor examined the patient's veins for signs of infection.
医生检查了患者的静脉，以寻找感染的迹象。
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2.Blood flows through the veins to the heart.
血液通过静脉流向心脏。
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3. Veins are responsible for carrying oxygenated blood back to the body's tissues.
静脉负责将氧气丰富的血液送回身体组织。