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BNC: 0 COCA: 26917

a muscle that surrounds an opening in the body and can tighten to close it括约肌

the anal sphincter肛门括约肌
a sphincter muscle括约肌
BNC: 0 COCA: 26917
BNC: 0 COCA: 26917
BNC: 0 COCA: 26917
sphincter

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