单词 | burglar alarm |
释义 | burglar alarm [`bǝr·glǝr ǝ¦lärm] ENGINEERING An alarm in which interruption of electric current to a relay, caused, for example, by the breaking of a metallic tape placed at an entrance to a building, deenergizes the relay and causes the relay contacts to operate the alarm indicator. Also known as intrusion alarm. |
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