sphincter
柯林斯詞典
1. N-COUNT A sphincter is a ring of muscle that surrounds an opening to the body and that can tighten to close this opening. 括約肌[技術(shù)]
...the anal sphincter. ...肛門括約肌。
返回 sphincter
1. N-COUNT A sphincter is a ring of muscle that surrounds an opening to the body and that can tighten to close this opening. 括約肌[技術(shù)]
...the anal sphincter. ...肛門括約肌。