burglar alarm

名词 burglar alarm:

1. a loud warning signal produced by a burglar alarm
2. a warning device that is tripped off by the occurrence of a burglary

1. If you will lend me your ear for a minute, I will explain how the burglar alarm works.
   如果你愿意听一会儿，我就讲讲防盗警报器是怎样工作的。
2. The burglar alarm was activated by mistake.
   防盗铃误响了。
3. The guard loosed the dogs when the burglar alarm went off.
   防盗警报器一响，警卫就放出了警犬。
4. The thieves ran away when the burglar alarm went off.
   防盗警报器一响，盗贼立刻逃走了。