And that's where our four-legged friends, the cows, come to the rescue.

这时，我们的四足————就会来拯救我们。

It's the famous robot quadruped, or four-legged dog-like machine from Boston Dynamics.

这波士顿动力公司著名的四足机器人，也就四条腿的狗一样的机器。

But the electronics network, Engadget reported that the company that makes these robot " dogs" was trying to develop a similar quadruped at a price point of $1,500.

但电子网络公司Engadget报道称，制造这些机器“狗”的公司正试图以1500美元的价格开发一种类似的四足动物。

And the situation is very different with other four-legged animals, tetrapods.

这种情况与其它四足动物有非常大的不同。

And whether this reality feels safe or scary depends on how well prepared people are to coexist with the world's largest four-legged predator.

这一存在让人感到安全还害怕取决于人们否对于与世界上这大的四足捕食者存做好了打算。

The four-legged lander is two meters tall and 3.5 meters wide.

这个四足着陆器高2米，宽3.5米。

Today three early tetrapods are known and none has five digits.

今天，已经知道早期有三种四足动物，但没有一种跟数字5有关系。

This four-legged monster is well protected and dangerous.

这种四足巨兽不仅防护严密，而且极度危险。

It was a magnificent sea otter from the genus Enhydra, the only exclusively marine quadruped.

倒下来的一只很好看的水獭，一只水兽，它可能住在海中的唯一的四足兽了。

Particularly if those skills might come in handy for our four-footed little friends.

尤其碰到我们可爱的四足迟早有用的技能。

The dog is the most knowing and clever of all four-footed animals.

四足动物当中，狗解人意、聪明的动物。

So you'll go through all fours first.

先来到四足跪姿。

And she'll have my tail cut off and my horns sawn off, and my beard plucked out, and she'll wave her wand over my beautiful clove hoofs and turn them into horrid solid hoofs like wretched horse's.

那她就会割掉我的尾巴，锯掉我的角，拔掉我的胡子，她会在我漂亮的偶蹄（哺乳动物中，羊属偶蹄目，四脚各有四趾，趾端有蹄，中间两个发达）上挥动魔杖，把它们变成那种难看的奇蹄（马的四足都只有一个蹄，故称奇蹄），就跟倒霉的马蹄一样。

But today, the kid's mom came in and said she wanted her child to walk around on two legs, because crawling around on all fours would be too “degrading.”

不过今天这个小屁孩的妈妈找上门来，嚷着要让她的小孩直立行走，因为四足着地爬来爬去实在太“掉价”了。

Check out Luna, a robot pup created by a Swedish AI startup company that says this four-legged friend can learn and adapt just like a real fur baby.

看看卢娜，一只由瑞典AI初创公司打造的机器人狗，该公司表示，这只四足机器人可以像真实的宠物一样学习和适应环境。

(And just in case you aren't familiar, tetrapods are four-limbed vertebrates that include amphibians, mammals, birds and reptiles.) That's at least 100 million years earlier than previous studies had suggested.

(以防你不熟悉，四足动物指四肢发达的脊椎动物，包括两栖动物、哺乳动物、鸟类和爬行动物。)这比先前研究认为的至少早了一亿年。

And then tetrapods evolved from fish and began adapting to living outside of the water part-time, initially gulping air and absorbing oxygen in the gut.

然后四足动物从鱼类进化而来，开始适应一些离开水的生活，初大口呼吸空气和吸收肠道中的氧气。

It would have been fast as far as a quadrupedal dinosaur goes, but that's nowhere near as much as a Tyrannosaur would have been.

在四足恐龙当中，它还算快的，不过跟暴龙完全没法比。

Lambert called his group's discovery " the most complete specimen ever found for a four-legged whale outside of India and Pakistan" .

兰伯特称他的小组的发现" 迄今为止在印度和巴基斯坦以外地区发现的完整的四足鲸标本。"

Bears are quadrupeds, meaning they walk on four legs, but they are able to stand up on their hind legs.

熊四足动物，用四条腿走路，但他们也能用后脚站立。