評(píng)論
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We are tetrapods, to whit one, two, three, four.
我們是四足動(dòng)物，瞧著，1，2，3，4
Every mammal, every dog, cat is, is a tetrapod, four legs.
所有哺乳動(dòng)物、每只狗、每只貓都是四足動(dòng)物，都有4條腿
A horse is a tetrapod evidently enough, so is a bird.
馬很明顯是四足動(dòng)物，鳥類也是
All the reptiles, all the frogs, the salamanders and even the snakes which don't have legs at all,
所有爬行動(dòng)物、所有青蛙、蠑螈、甚至是沒有腿的蛇
whales which don't seem to have legs, they're all tetrapod animals.
還有看似沒有腿的鯨魚，它們都是四足動(dòng)物
Scientists became bewitched by the fact that under the skin all tetrapods are basically the same.
所有四足動(dòng)物皮下結(jié)構(gòu)基本相似的現(xiàn)象使科學(xué)家們很感興趣
They all had spines kept firm by special interlocking spurs.
它們都具備由特殊關(guān)節(jié)突起牢固連接的脊柱
It is as true of us as it was of the dinosaurs.
我們和恐龍都是如此
All tetrapods had a pelvis attached to the backbone to support their weight.
所有四足動(dòng)物都有與脊椎相連的骨盆以支撐它們的體重
They all had a ribcage to protect their heart and lungs, and they all breathed air through nostrils.
它們都有用以保護(hù)心臟和肺的胸廓，它們都用鼻孔呼吸空氣
Their limbs invariably consisted of one single bone at the top.
它們的四肢總是由上面的一根骨頭
A pair of bones underneath leading to feet or hands
和下面連著足或爪的一對(duì)骨頭組成
which scientists noted never seemed to have more than five fingers or toes.
而且科學(xué)家們發(fā)現(xiàn)似乎從來沒有超過5根手指或腳趾
It was true of dinosaurs, human beings and even whales, for under their flippers they have five fingers.
這一現(xiàn)象存在于恐龍、人類、甚至是鯨魚中，因?yàn)樗鼈兊啮捴珒?nèi)也有五趾
This similarity convinced scientists all tetrapods must come from just one type of creature, a single common ancestor.
這種相似性使科學(xué)家們確信，所有四足動(dòng)物都起源于一類動(dòng)物，一個(gè)共同的祖先。
