防御系统的英文：
defense system
n. 防御，防御工事；防御物；防御措施；辩护；（比赛中的）守方
v. 抵御，防御
(in a match) the defense
守方
The defenses of the city must be strengthened.
这个城市的防御工事必须加强。
He was the then secretary of Defense.
他是当时的国防部长。
Offense is the best defense.
进攻是最好的防御。
Attack is the best form of defense
攻击是最好的防御
n. 体系，系统；设备；制度；方法；身体；次序
Is the system unstable?
是系统不稳定吗？
It was not a perfect system.
它不是一个完美的系统。
This is a sexpartite system.
这是一个由六部分组成的系统。
Anatomically, the nervous system is divided into the central nervous system and the peripheral nervous system.
解剖学上把神经组织分为中枢神经系统和周围神经系统。
disaccord between the economic system and political system
经济体制与政治体系间的不协调