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| 肛管 (上端在盆膈平面接续直肠，下端终于肛门。肛管被肛门内括约肌与肛门外括约肌所包绕,平时处于收缩状态,有控制排便的作用) | |||
| 肛管 | |||
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anal canal : 2 phrases in 1 subject |
| Surgery | 2 |
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