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What this shows is that when you select
结论表明　在挑选的(实验对象)时候
against aggression,
除去那些攻击性强的个体
You get almost all the same suite of
再来把狗和狼的繁殖实验进行比较
changes that you see when you compare dogs to wolves.
可以看出它们几乎有着相同的变化
American anthropologist, professor Brian Hare
美国人类学家布莱恩·海尔教授
has visited the breeding programme in siberia.
参观了这个位于西伯利亚的繁殖项目
He believes it shows that if you select for tameness,
他相信　如果挑选那些温顺的个体
changes in appearance will naturally follow.
那么培育出的幼崽外表也会跟着变化
I think the surprise when thinking about dog origins is that
想到狗的起源　我觉得令人惊讶的是　
there's so many ways that dogs are different from wolves.
现在的狗和狼会有这么多的差异
So is it that you had to
那是不是说人们必须
select for each of these traits individually?
逐一筛选每一个特质呢
Well, the answer
然而　从狐狸繁殖的结论中
from the fox work is no.
可以得出答案是否定的
If you just select for behaviour,
如果你以行为特征作为筛选的条件
a lot of the morphological
那么很多狼和狗之间的不同形态
and physiological changes between wolves and dogs, get dragged along.
和生理特征也会随之改变
You end up with this crazy variance, you know
最终 你会看到它们令人惊讶的变化
floppy ears, curly tails, you know,
比如松软下垂的耳朵　弯曲的尾巴
all these other things that are really cute to talk about.
还有其他人们认为可爱的特征
So you get a lot of stuff
因此　人们会得到很多额外的特质
for free when you select against aggression.
而原因只是选择了不具攻击性的品种
It's enabled him to draw some
这让他对驯养过程的研究
surprising conclusions about the process of domestication.
得到了一些意外的收获

重点解释

You end up with this crazy variance, you know最终你会看到它们令人惊讶的变化

end up:结束；告终；意外到达

You will end up in debt if you keep on spending money like that.

你要是老这样花钱,总有一天要负债。

I never think I'd end up work in a dump like this.

我从未想到，我最后会在这样污秽的场所工作。

It's enabled him to draw some surprising conclusions about the process of domestication.这让他对驯养过程的研究得到了一些意外的收获

enabled sb to do sth:使某人能够干某事

His large income enabled him to live in comfort.

他那丰厚的收入使他可以过舒服的生活。

Their help enabled me to finish the work with ease.

他们帮助我，使我能够顺利地完成工作

enable 的用法:

1.enable常使用在使某人做某事的结构上。

He invented a machine to enable people in wheelchairs to get up stairs.

他发明了一个机器可以使坐在轮椅上的人站起来。

2.enable后面常跟宾语和不定式。His perfect health enables his hard work. enable在句中表示“使……可能”，这种用法最好避免，使用不普遍。