他们轮换驮着对方。They give each other piggy-back rides.这个车间的工人上白班和上夜班每周轮换一次.The workers in this workshop do day and night shifts in weekly rotation.在交通信号轮换到绿灯以前不要穿过马路.Before the traffic signal turns to green light don't cro...
The position relation between mandible and maxilla or cranioaural.下颌骨对上颌骨乃至颅骨的位置关系.Gingiva, chin, lip, check and mandible are the most commonly injuried sites.下颌骨骨折最常见.软组织伤多见于龈 、 颏 、 唇 、 颊.But the retrusion of alveolar m...