frenulum of lower lip

例句：

1. 1. The doctor removed the frenulumto repair the injury.
   医生移除了下唇的系带来修复伤口。
2. 2. Thepatient's lip frenulum wasseverely damaged during the surgery.
   患者在手术中下唇的系带严重受损。
3. 3. Thefrenulum is a small band oftissue that connects the upper and lowerlips together.
   下唇系带是连接上下唇的小条状组织。