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

时，我们四足朋友——牛——就会来拯救我们。

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

是波士顿力公司著名四足机器人，也就是四条腿狗一样机器。

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.

但是电子网络公司Engadget报道称，制造些机器“狗”公司正试图以1500美元价格开发一种类似四足。

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

种情况与其它四足有非常大不同。

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.

一存在让人感到安全还是害怕取决于人们是否对于与世界上最大四足捕食者存做好了打算。

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

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，但没有一种跟数字5有关系。

This four-legged monster is well protected and dangerous.

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.

倒下来是一只很好看水獭，一只水兽，它可能是住在海中唯一四足兽了。

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

尤其是碰到我们可爱四足朋友迟早有用技能。

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

四足当中，狗是最善解人意、最聪明。

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.

那她就会割掉我尾巴，锯掉我角，拔掉我胡子，她会在我漂亮偶蹄（哺乳中，牛羊属偶蹄目，四脚各有四趾，趾端有蹄，中间两个最发达）上挥魔杖，把它们变成那种难看奇蹄（马四足都只有一个蹄，故称奇蹄），就跟倒霉马蹄一样。

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.”

不过今天个小屁孩妈妈找上门来，嚷着要让她小孩直立行走，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初创公司打造机器人狗，该公司表示，只四足机器人可以像真实宠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，四足是指四肢发达脊椎，包括两栖、哺乳、鸟类和爬行。)比先前研究认为至少早了一亿年。

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.

然后四足从鱼类进化而来，开始适应一些离开水生活，最初是大口呼吸空气和吸收肠道中氧气。

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，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" .

兰伯特称他小组发现是" 迄今为止在印度和巴基斯坦以外地区发现最完整四足鲸标本。"

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

熊是四足，用四条腿走路，但他们也能用后脚站立。