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
3. Any of numerous small rodents of the families Muridae and Cricetidae, such as the common house mouse(Mus musculus), characteristically having a pointed snout, small, rounded ears, and a long, naked or almost hairless tail. 
   鼠一种鼠科和仓鼠科家族的小型啮齿类动物，如常见的家鼠（台湾鼷鼠），典型特点为尖嘴、小圆耳朵、长而无毛或少毛的尾巴

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• 1. 括约肌
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