| 单词 | 括约肌 |
| 释义 | 〔achalasia〕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，如食道内的括约肌〔sphincter〕A ringlike muscle that normally maintains constriction of a body passage or orifice and that relaxes as required by normal physiological functioning.括约肌：一般保持身体管道或通气口的收缩，并能在正常的生理作用下放松的环状肌肉 |
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