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。

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。

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

四足动物当中，狗是最善解人意、最聪明的动物。

Whitney said it was the top " predator of its environment that included different kinds of ancient fish and sharks as well as other, smaller early tetrapods."

惠特尼说，它是“其环境中的顶级捕者，该环境中包括不同种类的古代类，以及其他较小的早期四足动物。”

(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，四足动物是指四肢发达的脊椎动物，包括两栖动物、哺乳动物、鸟类爬行动物。)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.

然后四足动物从类进化而来，开始适应一些离开水的生活，最初是大口呼吸空气吸收肠道中的氧气。

A gleeful Ned proposed that we return the next day to this magic island, which he planned to depopulate of its every edible quadruped.

快乐的尼德·兰提议明夭再到这个迷人的岛上来，他要把所有可以吃的四足动物都打尽，一个不留。

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

熊是四足动物，用四条腿走路，但他们也能用后脚站立。

Pachyrhinosaurus though was a more compact quadrupedal kind of animal, a more sturdy build than what we see in Albertosaurus.

肿鼻角龙是一种更结实的四足动物，比阿尔伯特龙身体更加粗壮。

This was the missing link between bony fishes and tetrapods, including human beings, so this was a fantastic expectation.

这是硬骨包括人类在内的四足动物之间缺失的一环，所以对我们来说这种期待很奇妙。

The four-legged animal is believed to have been just 10 centimeters tall and about 40 centimeters long.

据信，这种四足动物只有10厘米高，约40厘米长。

There were bipeds, tripeds and quadrupeds.

有两足、三足四足动物。

They were able to piece together evidence that the last common ancestor of all lungfish and tetrapods started vocalizing more than 400 million years ago.

他们能够拼凑出表明所有肺四足动物的最后一个共同祖先在四亿多年前开始发声的证据。

In particular they sought lobe-finned fish of the type that presumably were ancestral to us and all other walking creatures, known as tetrapods.

据推测，那种是所谓的四足动物，即我们其他所有会行走的动物的祖先。

Unlike many early tetrapods, bones of Whatcheeria have been discovered from different points in the animal's life.

与许多早期四足动物不同的是，人们发现了瓦切螈不同生命阶段的骨骼。

Whatcheeria was an early tetrapod, as the first land animals with backbones were known.

瓦切螈是一种早期的四足动物，作为第一批有脊椎的陆地动物而为人所知。

It also stated that acoustic communication evolved independently in most major tetrapod groups, with origins in the range of 100 million to 200 million years ago.

研究还指出，在主要的四足动物种群中，声音交流进化彼此独立，起源于一亿至两亿年前。

Your few four-legged ancestors, the tetrapods, struggled in tropical river plains.

你的少数四足祖先， 四足动物，在热带河流平原上挣扎。

I’m using “cow” to mean “four-legged farm animal that moos”.

我用“牛” 来表示“会哞叫的四足农场动物” 。