self-combustion

例句：

1. 1. The engine's self-combustion is a common cause of engine failure.
   发动机的自燃是发动机故障的常见原因。
2. 2.The firefighters were able to extinguish the self-combustion without causing any injuries.
   消防员们成功地扑灭了这场自燃，没有造成任何伤害。
3. 3. The scientist discovered that the self-combustion of this chemical could lead to an explosion.
   科学家发现这种化学物质的自燃可能会导致爆炸。