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
环形 annular; ringlike; ring form; bight; annularity◇环形癌 annular carcinoma; 环形电路 [讯] loop circuit; ring circuit; 环形公路 belt highway; 环形交通 rotary traffic; 环形交通枢纽 circle; circus; 环形结构 circle structure; 环形联合 circular integration; 环形路 round; 环形山 [天文学] lunar crater; crater; ring structure; 环形天线 loop; box loop; ring antenna; loop antenna; coil antenna; closed aerial; radio loop; 环形铁路 belt(-line) railroad; circuit railroad