But all 600 living ferrets today are the descendants of just seven ancestors.

但所有 600 只现存的雪貂都来自共同的七个祖先。

Therefore we need desperately a calf on the ground so that these two existing northern white rhinos, can teach the new calf how to behave as a northern white rhino.

因此我要一只幼崽落，这样这两只现存的北方白犀牛才能教会这只新生幼崽如何表现得像一只北方白犀牛。

It also protected teachers against punishment for “helping students understand, analyse, critique and review in an objective manner the scientific strengths and scientific weaknesses of existing scientific theories.”

根据法案，教师还能“帮助学生以客观的方式理解、析、评论及考察现存科学理论中的优缺点”而不受处罚。

And the Greater London Authority has been aware of this for a while, and the main causes are population growth, the fact that existing cemeteries are almost full.

导致这一问题的主要原因是人口增长，事实上现存的墓几乎已经全满了，英国的风俗是坟墓是永久占有的。

It's fitting for one of the oldest surviving documents of the oldest surviving governing document.

它是现存最古老的宪法文件之一。

The rain is going to return in just a few minutes, but it's still been a nice little trip out to visit the world's oldest still standing house.

几钟后又要下雨了，但参观世上现存最古老的房屋仍然是次不错的体验。

Even though we humans like to classify all creatures into different groups and names, this is based on how things currently are, and not how they were millions of years ago.

即使人类喜欢将所有生物类并冠上不同的名字，类的依据是根据现存的生物，而非它年前的状态。

In what U.S. state would you find the tallest living tree on earth?

你会在美国的哪个州找到世界上现存最高的的树木？

That's why it's the company SkyCool's mission to make existing cooling systems run more efficiently, by taking advantage of a phenomenon that exists in nature.

这就是为什么，SkyCool的使命是利用自然现象，提高现存制冷系统的效率。

Located in Rolle, Switzerland, this school was founded in 1880 and is one of the oldest schools to ever exist in Switzerland.

这所学校位于瑞士罗勒，成立于 1880 年，是瑞士现存最古老的学校之一。

At the world’s oldest surviving railway station, you’ll find The Museum of Science and Industry.

在全世界现存最古老的 火车站，你會找到科學產業博物館 (The Museum of Science and Industry)。

With Halim, we head south — still home to Morocco's remaining traditional nomad communities.

我与哈利姆一同往南走——那里仍然是摩洛哥现存传统游牧社区的所在。

The only existing structure was a small school that had opened in 1935.

唯一现存的建筑是 1935 年开办的一所小型学校。

Almost all of the existing galaxies have died, and, unfortunately, there are almost no clouds of gas left which are necessary for the formation of new stars.

几乎所有现存的星系都已经死亡，不幸的是，几乎没有留下形成新恒星所必的气体云。

But very few of the birds exist, and the species is considered critically endangered.

但这种蜂鸟的现存数量非常少，而且这个物种被认为是极度濒危物种。

Until now, however, the technique has been used mostly on the molars of living mammals.

但直到现在，这项技术主要用于现存哺乳动物的臼齿。

Fewer than 350 North Atlantic right whales survive.

现存的北大西洋露脊鲸不到350头。

The oldest surviving pairs, dating to 1300 BC, belonged to horsemen.

现存最古老的几条裤子可追溯到公元前1300年，属于某些骑手。

These are leatherback sea turtle hatchlings, the largest species of turtle alive today.

这些是棱皮龟幼龟，是现存最大的海龟物种。

Our knowledge of the art that existed is so partial.

我对现存艺术的了解是如此片面。