Eventually, their front limbs became flippers and their hind limbs became weak and unnecessary.

最终，们的前变成了鳍状，们的后变得虚弱和多余。

And they were almost right. Longer front legs and larger toe pads indeed helped.

他们的想法基本上是对的。前更长、趾垫更大确实有帮助。

It affected the young animal's front legs, which became hyperextended.

这种疾病影响了幼崽的前，使前腕关节过度伸展。

Its powerful arm muscles are composed of 80% fast-twitch fiber, a third more than humans.

强壮的前肌肉中百分之八十是快缩肌纤维，比人类的多三分之一。

The first was its trio of claws extending from each hand.

第一件是每个前伸出的三个爪子。

All birds have two legs and two arms; but these arms are not like ours.

所有的鸟儿，都有两个后，两个前。但是鸟儿的前， 跟我们人类的不一样。

We call them wings, and the birds use them for flying.

我们管鸟儿的前叫" 翅膀" ，鸟儿是用翅膀来飞翔的。

Powerful forelegs enable it to rip apart a termite hill with ease.

有力的前让们能够轻易地掰开白蚁巢。

Technically, two-toed sloths should be really called two-fingered sloths because the difference is only their front limbs.

从技术上讲，二趾树被称为二指树，因为们的区别只是前。

The shape of the creature's hands and forelimbs suggest it was a skillful and powerful digger, scientists say.

科学家说，这种生物的手和前的形状表明是一种熟练有力的挖掘者。

Whereas with pterosaurs, with this strategy, you're focusing it into one area and really use it both ways.

所以，翼龙的飞行只会使用到前。

What you can see is that large toe pads and strong front legs give some lizards a tighter grip.

你可以看到的是，大的护趾和强壮的前使一些蜥蜴抓握更牢。

She has long, strong front legs to help her climb around for food 20 metres up in the canopy.

的前又长又有力，可以帮助在 20 米高的树冠上四处攀爬觅食。

Led by his super sensitive nose, his long limbs carry him many miles a day in search of carrion.

凭借极度敏感的嗅觉和长长的前，短面熊为了寻找腐肉能一天行进数英里。

Although the arms of Albertosaurus were small compared to its overall body size, they were still packed in muscle.

尽管阿尔伯特龙的前与体型相比很小，们也有发达的肌肉。

This meant that the arms were very strong, but their function is somewhat of a mystery.

这说明的前非常强壮，不过其功能有点像个迷。

Its small arms are useless in the water, leaving it to rely on its two powerful legs.

短小的前在水中没有用，只能靠两条有力的后腿。

Like, when primates and squirrels get more practice using their forelimbs to climb trees, that can favor a bigger cerebellum.

比如，当灵长类动物和松鼠用们的前爬树得到更多的练习时，会有更大的小脑。

You see, it is hard for bears to run down hill, because their hind legs are longer than their front ones.

你知道的，熊很难跑下山，因为们的后比前长得多。

As he rips back, he rips an enormous chunk of flesh from the underside of the arm.

往后拽时，从其前下侧拽下来相当大一块肉。