protractility

常見(jiàn)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;
  上嘴唇被一個(gè)系帶連接到吻部，兩者是連續(xù)的，而上頜則是被局限不能伸出的；
• protractile limbs and claws.
  可伸展的肢體和爪子
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