Is just a chemical reaction that compels animals to breed.

不过是让动物衍后代的化学反应罢了。

Has the earth ceased to yield its increase?

难道地球已不再衍生息?

As fauna and flora flourish, Earth's climate slowly recovers from millennia of human impact.

随着动植物的衍，地球的气候逐渐从人类数千年的影响中恢复过来。

Also, the trait spreads only with each successive generation.

其次，性状只有在不停衍下才会传播。

Those at Woburn Abbey, in England, prospered.

那些在英格兰沃本修道院的不断衍。

Within a few generations most had forgotten their native tongues.

他们衍几代后，大部分人就已经忘记了自己的母语。

It's like a gated community for vermin of every sort.

就像是个衍各种害虫的封闭空间。

But in hurricane-free areas, docile colonies had more babies.

但在没有遭遇飓风袭击的地区，温和蜘蛛群衍的后代数量更多。

These leviathans are making a journey to nesting sites they've used for generations.

这些庞然大物正在前往它们世代衍的筑巢地。

The National Audubon Society says that 60 percent of Atlantic puffins breed there.

国家奥杜邦协会表示，60%的大西洋海鹦在衍。

Beaver thrived in the United States and Canada for centuries.

海狸在美国和加拿大衍了好几个世纪。

People have been doing this forever, and it's this shared experience that everyone has.

衍后代是人类诞生以来就在做的事情，这种共享的经验是每个人都有的。

In their modern form, coral reefs have thrived on Earth for over 50 million years.

以现代形式存在的珊瑚礁在地球上已经衍了超过 5000 万年。

You survive and reproduce, and pass that trait on to some of your offspring.

你存活下来，衍后代，并将这种特质遗传给你的后代。

Yeah, they breed and they nest on the ground.

对，鸮鹦鹉在地上衍、建巢。

Today, the koala has climbed back from the brink of extinction and is thriving again.

今天，考拉从绝种边缘爬了回来并且再度衍。

Mats of microbial organisms are thriving in frigid environments that receive virtually no sunlight.

有机微生物丛在没有任何阳光的极度寒冷的环境下衍。

We're cells of life and that actually grew here. Maybe we could all be Martians.

我们生命的细胞如今在这里衍。或许我们都曾经是火星人。

Some birds find it harder to make homes in the south, too.

有些鸟类也发觉在南部地区衍更为艰难。

A preference for them is thus likely to enhance a man's reproductive success.

因此对他们的偏爱貌似能增强男性的衍成功率。