共同共有的英文：
co-ownership; joint ownership; tenancy in common

参考例句：

In common for or by all of a group
共同(的);共有(的);共用(的)

ownership是什么意思：
n. 所有权；物主身份

His claim to ownership is invalid.
他的所有权是无效的。

She disclaimed ownership of the vehicle.
她放弃了这辆车的所有权。

The matter in dispute is the ownership of the house.
眼下的纠纷是这所房子的所有权问题。

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!

tenancy是什么意思：
n. 租佃,租赁

The rent cannot be increased during the term of this tenancy agreement.
在本合同有效期内，租金不予调整。

and (3) the terms of tenancy agreed to initially are scrupulously adhered to by both parties
(三)双方都严格遵守彼此最初议定的条件。

They both sign a lease(a written legal agreement defining the terms of the tenancy)
双方共同签订lease(合同)--规定tenancy(租赁)条款的法律性书面协议