distal margin 远边 He backed the car into the space with a narrow margin to spare. 他将车倒进一个非常窄的停车位置。
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Purpose: To measure the length of distal margin from the lower border of tumor at different time in anterior resection for rectal cancer and analyze their relationship.
目的：研究直肠癌前切除术肿瘤下切缘的长度在不同时间的变化及其规律。
Objective To investigate the safe distal surgical resection margin of rectal cancer.
目的探讨直肠癌手术远端肠管长度的安全范围。
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