alarm hammer lever

例句：

1. 1. The alarm clock woke us up at 6:00 a.m.
   闹钟在早上六点叫醒了我们。
2. 2. The police were called to the scene of the accident for an emergency alarm.
   警察被叫到事故现场去处理紧急情况。
3. 3. The fire department was notified of the fire by the local alarm system.
   消防部门通过当地的报警系统得知了火灾的消息。