burglar alarm

防盗报警器，防盗警铃，防窃报警器

Infrared burglar alarm
红外防盗报警器收藏
The burglar alarm was activated by mistake
防盗铃误响了收藏
The thieves ran away when the burglar alarm went off.
防盗警报器一响,盗贼立刻逃走了.收藏
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。收藏
Burglar alarm going off at any time of the day or night serve only to annoy passers-by and actually assist burglars to burgle.
防盗警察报器在白天和黑夜的任何时候都会响起来，它的作用只是骚扰过路行人，而实际上却帮助窃入室行窃。收藏

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a loud warning signal produced by a burglar alarm
- they could hear the burglar alarm a mile away
a warning device that is tripped off by the occurrence of a burglary

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