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 arm are visible under the skin.
手臂上的静脉在皮肤下可见。
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2. Blood flows through the arteries to reach the heart.
血液通过动脉流向心脏。
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3. Capillaries are tiny blood vessels that filter blood and remove waste products.
毛细血管是微小的血管，负责过滤血液并移除废物。