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1. The veins in the skin are responsible 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. The doctor inserted a needle into her arm to draw blood for testing.
医生在她的手臂上扎了一根针来抽血进行检测。
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3. Blood vessels are essential for transporting nutrients and oxygen throughout the body.
血管对于输送营养物质和氧气在整个身体中至关重要。