There are two sub-species of white rhinoceros, northern white rhinos and southern white rhinos.

白犀牛有两个亚种，北方白犀牛和南方白犀牛。

There are now thousands of southern white rhinos.

现在这里有数千头南部白犀牛。

Conservationists flew 30 white rhinos from South Africa to Rwanda.

环保人士将30头白犀牛从南非空运到卢旺达。

Southern white rhino males can either be dominant or subordinate.

雄性南方白犀牛既可以是主导者也可以是从属者。

The last male northern white rhino was a 45-year-old named Sudan.

最后一头雄性北白犀牛是一头45岁的犀牛，它的名字叫苏丹。

Southern white rhinos were in similar danger in the late 1800s'.

在19世纪晚期，南方白犀牛也曾面临类似的危机。

The two remaining female northern white rhinos, Najin and Fatu, live in Kenya.

剩下的两头雌性北白犀牛纳金和法图生活在肯尼亚。

Scientists are looking into the possibility of saving the northern white rhino through in-vitro fertilization.

科学家们正在对通过体外受精挽救北白犀牛物种的可能性进行研究。

They will be put into a surrogate mother — a southern white rhino — in the coming months.

在接下来的几个月里，它们将被放入代孕妈妈——一只南方白犀牛的体内。

The Northern white rhino is a wonderful example because the world is watching a species go extinct.

北方白犀牛是一个很好的例子，因为世界正看着一个物种走向灭绝。

The white rhino, which is the largest, may grow as long as 13 feet or 4 meters.

体型最大的白犀牛可以长至13英尺或4米。

But our next story concerns white rhinos, the largest species which can weigh more than 7,700 pounds.

但我们接下来要说的是白犀牛，它们体型最大，可重达7700磅以上。

And we were able over the years to bank the cells of 12 Northern white rhinos.

多年来，我们保存了 12 头北方白犀牛的细胞。

Ultimately, what we intend to do is to produce Northern white rhinos in the lab.

最终，我们打算在实验室里培育出北方白犀牛。

Thirty white rhinos complete a long journey from South Africa to a new home in Rwanda.

30头白犀牛终于完成了从南非到卢旺达新家的长途旅行。

The white rhinos are going to be seen in the open spaces by almost all the tourists.

几乎所有的游客都能在空地上看到白犀牛。

They're the two only northern white rhinos, which is distinct from the southern white rhinos because they have shorter legs, heavier ears.

他们是仅存的两只北白犀牛，与南方白犀牛截然不同，因为它们的腿更短，耳朵更重。

And the fact that the Northern white rhino is really teetering on the brink of extinction.

事实上，北方白犀牛正处于灭绝的边缘。

Then white rhinos are really on the brink of extinction.

到时候白犀牛就真的濒临灭绝了。

The International Union for Conservation of Nature has put the southern white rhino on its Red List of Threatened Species.

国际自然保护联盟已将南方白犀牛列入濒危物种红色名单。