以下为句子列表：
英文: Either of two large veins that drain blood from the upper body and from the lower body and empty into the right atrium of the heart.
中文: 腔静脉把血从身体的上部和下部抽光然后流入心脏的右心房的两支大静脉之一
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英文: Here is another large pulmonary thromboembolus seen in cross section of this lung. The typical source for such thromboemboli is from large veins in the legs and pelvis.
中文: 切面上可见一个大的肺血栓栓子。它的主要来源是下肢和盆腔的大静脉。
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