常见例句when the upper lip is connected to the snout by a frenum, the two are continuous and the upper jaw is restricted from being protractile; 上嘴脣被一個系帶連接到吻部，兩者是連續的，而上頜則是被侷限不能伸出的；protractile limbs and claws. 可伸展的肢躰和爪子 返回 protractility