- yet just like in today's forests...
但就像今天的森林中一样 - danger was never far away.
危险永远不会离得太远 - The discarded skin of their ancient adversary.
它们古老对手的蜕皮 - The snake.
蛇 - Snakes evolved around the same time as the first true mammals.
蛇的进化时间 与第一批真正的哺乳动物大致相同 - They lost the arms and legs of their reptilian ancestors
它们失去了爬行动物祖先的四肢 - and developed a streamlined body...
并发展出流线型身体
The snake. 蛇
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