alarm crown wheel core

例句：

1. 1. The alarm clock woke meup at 6:00.
   闹钟在六点把我叫醒了。
2. 2. The firedepartment was called to the scene of thealarm.
   消防部门被叫到了火灾现场。
3. 3.She set off an alarm when she sawthe thief.
   她看到小偷时触发了警报。