1. 松紧口装置：spherulitictexture 球粒结构 | sphincter 松紧口装置 | sphincteralachalasia 括约肌弛缓不能

2. 括约肌[医]：胃食管反流[医]gastroesophageal reflux | 括约肌[医]sphincter | 胃食管撕裂-出血综合征[医]Gastroesophageal laceration-hemorrhage syndrome

3. (括約筋)：spermophlebectasia (精索静脈瘤) | sphincter (括約筋) | sphincteritis (括約筋炎)

1. 括约肌
    A sphincter is a ring of muscle that surrounds an opening to the body and that can tighten to close this opening.

    e.g. ...the anal sphincter.
           肛门括约肌

1. a ring of muscle that contracts to close an opening

    Synonym: anatomical sphinctersphincter muscle