There are perpetuities in some countries, which have no expiration date.

一些国家有永久债券，它们没有到期时间。

Farmers in the country can acquire ownership of land in perpetuity.

该国的农民可以永久获得土地所有权。

A perpetuity is an annuity that has no maturity.

永续年金就是指没有兑现期限的年金。

They do not own the land in perpetuity.

他们并不永久拥有这片土地。

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。

We do not sterilize land in perpetuity.

对土地没有永久性损害。

The US 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。

I never before saw a smile caught like that, in perpetuity.

我从未见过谁的笑脸僵成那幅模样。