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People can control their defecation, to some extent, by contracting or releasing the anal sphincter.
在一定程度上, 人们能通过收缩或放松肛门括约肌来控制排便.
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People can control their defecation, to some extent, by contracting or releasing the anal sphincter.
在一定程度上, 人们能通过收缩或放松肛门括约肌来控制排便.
网络文摘精选
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