防御 defense 积极防御 active defense; 消极防御 passive defense; 防御外来侵略 guard against external aggression; 共同防御 work together for the common defence; 由防御转入进攻 go over from the defensive to the offensive; 纵深防御 defence in depth; 加强防御力量 strengthen defence capabilities; 防御国家外部敌人的颠覆和侵略 guard against subversion and aggression by external enemies; 迫使敌人转入防御地位 force the enemy onto the defensive; 进攻是最好的防御。 the best defense is to attack
环境制御设施 research facilities product lines environment control devices; research facilities, product lines, environment control devices