Is just a chemical reaction that compels animals to breed.

不过让动物繁衍后学反应罢了。

It's a model full of danger for future generations.

这一个危害子孙后模式。

Or is there something about the bromance that holds the key to reproductive success?

还兄弟情谊成功繁衍后关键？

Animals which bring up or nourish their young on milk are called mammals.

依靠奶来抚养后动物就叫做哺乳动物。

That is what we owe our forebearers, one another, and generations to follow.

这我们欠我们祖先、我们彼此和我们后。

She believes the forest she is planting will be a gift to future generations.

她相信她种植森林将给后礼物。

And he suspects it might have something to do with the parenting.

他怀疑这可能与郊狼养育后方式有关。

They showed how genetic qualities are passed to living things from their ancestors.

他们展示了基因品质如何从祖先遗传给后。

We borrow it from our children.

而从我们后借来。

But the ancestors of baleen whales had a very different diet.

须鲸祖先饮食习惯与这些后差别非常大。

If she doesn't appear soon, it could be too late for them to breed successfully.

如果雌性信天翁还不出现他们将错过顺利繁衍后机会。

In turn, their nursemaid will benefit the demanding offspring.

反过来，它们保姆作用有助于后健康。

Thus, the pack's so-called alpha wolves are actually just the parents leading their offspring.

因此，狼群所谓阿尔法狼实际上只领导自己后父母。

What worries Ippolito more than the business impact is the threat to future generations.

比商业影响更让Ippolito担心对子孙后威胁。

Scientists have developed the technique to prevent some genetic diseases from being passed on.

科学家发明这种能预防一些遗传疾病传给后技术。

It's a brutal way to raise a family.

这种养育后方式非常残酷。

Such a genetic tweak would ordinarily be winnowed out by natural selection over subsequent generations.

这样基因变异通常会在后自然选择中被淘汰掉。

" These nutrients can then be used by future generations of life, " Marek said.

" 然后这些营养物质就可以被后生命所利用。"

Come fall, adult birds with offspring reverse course and head back to their winter homes.

秋天到来，带着后成年候鸟便会调转方向，回到过冬家园。

A British company has found a way to genetically modify mosquitoes to kill their offspring.

一家英国公司已经发现了一种通过改变蚊子基因杀死它们后方法。