1. pain caused by venous swelling at or inside the anal sphincter. 
   肛门内外因静脉肿胀而疼痛。
2. The failure of a ring of muscle fibers, such as a sphincter of the esophagus, to relax. 
   弛缓不能指肌肉纤维不能松弛，如食管内的括约肌

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