fracture of alveolar bone

例句：

1. 1. He had a fractured arm after the fall.
   他摔伤后手臂骨折了。
2. 2. The car's engine has a crack in it, and it needs to be fixed.
   这辆车的引擎有裂缝，需要修理。
3. 3. The bone was fractured during the accident.
   在事故中骨头断裂了。