联防的英文：
joint defence

参考例句：

Mark space
区域联防

joint是什么意思：
adj. 联合的
n. 关节，接头
v. 链接，使有接头，焊接

The finger joints are called knuckles.
手指的关节叫做指关节。

It's a really classy joint.
这是一个确实高级的公共场所。

That shop is plain a clip joint
那可是不定一家漫天要价、大敲竹杠的商店啊!

A knobbed bone, as of a knuckle or joint.
指节骨一种圆形突出的骨头，如指关节或关节的

It is a joint venture with private industry.
这是一个与私有企业合资的企业。

defence是什么意思：
n. 防御；国防，防卫手段；防御物，防御设备；辩护；后卫

Then they hastily came to his defence.
这时他们急忙来为他辩解。

He is the Shadow Minister of Defence.
他是影子内阁的国防部长。

The most effective defence is offence.
最好的防御是攻击。

The court issued a defender of defence.
辩护人当庭发表了辩护意见。

A weak barrier,defence,team
不结实的挡板、无力的防御、弱队