| 词汇 | sphincter |
| 释义 | sphincter/ˈsfɪŋktə(r) ||; ˈsfɪŋktɚ/noun [c] (technical术语) a ring of muscle that surrounds an opening in the body and that can become tighter in order to close the opening 括约肌: ◇the anal sphincter 肛门括约肌 |
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