They do not own the land in perpetuity.

他们并不永久拥有这片土地。

《牛津词典》

The U.S. government gave the land to the tribe in perpetuity.

美国政府将这块土地永久性划拨给该部族。

《柯林斯英汉双解大词典》

So we have sufficient reason to carry forward and further develop it in perpetuity.

我们有理由永远把它继承并发扬光大。

youdao

As Hanson says, thus arose the kleros, or the idea of a privately held plot attached not to any one person, but rather in perpetuity to a single farm family or oikos.

如汉森所言,kleros兴起了,或是说有了私有土地,而不再属于单个人的观念产生了,也可永久的属于单个的农业家庭或者领主

耶鲁公开课 - 古希腊历史简介课程节选

The Laffer Shares would be equity, and they would be entitled to receive dividends in perpetuity.

FORBES: Let's Finance Supply-Side Tax Cuts With Laffer Shares

Medallion and Bergeron also purchased the rights to Petty's name in perpetuity for Nascar-related deals.

FORBES: Magazine Article

In fact, Mr Walker, a Republican, wants to rule out negotiations with unions about benefits in perpetuity.

ECONOMIST: Cracking down on collective bargaining