set off

柯林斯词典

1. PHRASAL VERB When you set off, you start a journey. 启程; 出发
Nichols set off for his remote farmhouse in Connecticut. 尼科尔斯启程前往他位于康涅狄格州的偏远农舍。
The president's envoy set off on another diplomatic trip. 总统特使再次踏上外交之旅。
2. PHRASAL VERB If something sets off something such as an alarm or a bomb, it makes it start working so that, for example, the alarm rings or the bomb explodes. 引爆 (炸弹); 触发 (警报)
Any escape, once it's detected, sets off the alarm. 逃跑一旦被侦察到，就会触发警报。
Someone set off a fire extinguisher. 有人打开了灭火器。
3. PHRASAL VERB If something sets off an event or a series of events, it causes it to start happening. 引发; 激起
The arrival of the charity van set off a minor riot as villagers scrambled for a share of the aid. 赈济货车一到达，便引发了村民争抢救援物资的小规模骚乱。