1. includes cuckoo; ani; roadrunner. 
   包含布谷鸟；美洲黑杜鹃；走鹃。
2. pain caused by venous swelling at or inside the anal sphincter. 
   肛门内外因静脉肿胀而疼痛。
3. 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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• 1. 肛门括约肌
  spherule 小球...sphincter ani 肛门括约肌...sphincter 括约肌
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• 2. 肛门内括约肌
  肛门内括约肌（sphincter ani
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