名词
中文翻译：静脉
同义词：
['veins', 'arteries', 'capillaries']
例句：
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1. The veins in the skin areresponsible for carrying blood away from the heart.
皮肤中的静脉负责将血液从心脏运走。
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2. Blood flows through the arteries and capillaries to reach themuscles.
血液通过动脉和毛细血管流向肌肉。
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3.The veins in the legs are visibleunder the skin.
腿部的静脉在皮肤下可见。