引信

例句：

1. 1.The gun was set off by the detonation of the grenade.
   炸弹的爆炸触发了枪。
2. 2.The rocket's engine is designed to be triggered by a small signal.
   火箭发动机被设计为通过一个小信号触发。
3. 3. The bomb was set off by an unseen hand.
   炸弹被一个看不见的手触发。