set off a bomb.

• 炸弹爆炸

set off a bomb.的用法和样例：

例句

1. They felt the ground quake as the bomb exploded.
   炸弹爆炸时，他们觉得地都震动了。
2. In a recent incident two bombs exploded.
   在最近一次事件中有两颗炸弹爆炸了。