In the embryonic jaw, soft tissues, teeth and bone are all developing together without external stresses such as chewing and talking, whereas the adult jaw is a hard, busy place.
英
美
- 在胚胎的颌部,软组织、牙齿与骨头是在没有外来压力(如咀嚼与说话)的状况下共同发育,但成年的颌却是一个坚硬而繁忙的部位。