所有爬行动物都必须自然脱皮才能成长
这种爬行动物的皮肤坚韧并带有鳞片。
我们沿着大桥窄窄的钢制格子爬行着。
We were crawling along the narrow steel lattice of the bridge.
大多数爬行动物通过在陆地产卵进行繁殖。
他们从他们的机器接出了一根通过地下室和舞台间爬行空间的电缆。
They ran a cable from their machine through a crawl space between the basement and the stage.
爬行动物曾经位居食物链顶端。
蛇，龟和鳄鱼都是爬行动物。
大多数爬行动物会怕猫吗？
巨型蟾蜍和安第斯鬣蜥是爬行动物的代表。
The Giant Toad and Andean Iguana are some examples of reptiles.
海龟是带壳的爬行动物。
相比于爬行动物，哺乳动物的这一特性更加典型。
鳄鱼是爬行动物。
当然，对于爬行动物来说，这是一个平衡的过程。
沙漠很整洁，因为里面没有杂草，没有爬行的东西。
Deserts were tidy because there were no weeds in them, nothing that crawled.
我的意思是，鳄鱼的大脑是所有爬行动物中最发达的。
I mean, crocodiles' brains are the most developed of any reptile.
虽然爬行动物身上通常都有鳞片，但翼龙的皮可能有很多毛。
Although scales typically cover reptiles, the pterosaurs probably had hairy coats.
从那种意义上来说，比起其他爬行动物的大脑它们更接近哺乳动物的大脑。
In that sense, they are closer to mammals' brains than other reptiles' brains.
今天，让我们来看看一种爬行动物，一种在过去七千万年里没有进化很多的食肉动物。
For today, let's look at a reptile, a predator that hasn't evolved much in the last seventy million years.
一些科学家认为，许多种类的恐龙的新陈代谢更像温血哺乳动物，而不是冷血爬行动物。
Some scientists contend that many species of dinosaur had a metabolism more like a warm-blooded mammal's than a cold-blooded reptile's.
道德推理的最基本形式——在道德上相当于学会爬行——是将他人的利益与自己的利益进行权衡。
The most elementary form of moral reasoning—the ethical equivalent of learning to crawl—is to weigh others' interests against one's own.
爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。
Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.
这将使机器人可以在胃肠道周围爬行，用适当的外科手术工具施行治疗，且可以进行活体组织检查。
This will allow the robot to crawl around the gastrointestinal tract, perform treatment with appropriate surgical tools, and perform biopsies.
虽然现代爬行动物一般不会形成纤维板层骨，但在最佳环境下长大的幼年鳄鱼却能形成纤维板层骨。
Although modern reptiles generally do not form fibro-lamellar bone, juvenile crocodiles raised under optimal environmental conditions do.
曾经是海底的陆地现在成了城镇周围广阔肥沃的田野；这里曾经有过螃蟹爬行，现在则有驴子择路而行。
Land that was once at the bottom of the sea now lies around the town in wide, fertile fields; where crabs once crawled, donkeys pick their way.
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