State - of - the - art safe rooms include an independent phone line , a back - up generator , oxygen scrubbers to replenish the air supply , and closed - circuit television screens connected to computers 目前科技先进的安全屋包括一条独立电话线、一台备用发电机、可供氧换气的制氧机,以及与计算机相连的闭路电视屏幕。
