an electrical device that sets off an alarm when someone tries to break in
security measure的用法和样例:
例句
Police are encouraging anyone in possession of heavy construction machinery to keep it under tight security to help prevent such crimes. 警方呼吁,所有拥有重型建筑机器的人们采取严密的安全措施看好自己的机器,以防银行窃贼的阴谋得逞。