[fáng yù]
defense
active defense
积极防御
passive defense
消极防御
guard against external aggression
防御外来侵略
work together for the common defence
共同防御
go over from the defensive to the offensive
由防御转入进攻
defence in depth
纵深防御
strengthen defence capabilities
加强防御力量
guard against subversion and aggression by external enemies
防御国家外部敌人的颠覆和侵略
force the enemy onto the defensive
迫使敌人转入防御地位
The best defense is to attack.
进攻是最好的防御。