Double password lock, closed - circuit television surveillance systems, video intercom system.双重密码门锁, 闭路电视 监视系统, 可视对讲系统.They walked through the trees to a second hut, cunningly camouflaged against air surveillance.他们穿过树林...
Police keep track of the kidnapper using electronic surveillance equipment.警方利用电子监视设备跟踪绑架者。Leaving aside the question of privacy, constant surveillance can be remarkably convenient.如果不去管隐私问题的话，实施不间断监视其实是非常便利的。The police ...