But there is more to jaws than that. 但是颌的作用不止于此
Today, there are more than 30,000 species of fish. 今天存在超过三万种鱼
with more diversity than ever before. 其多样化程度前所未有
But more than half a billion years ago, 但是五亿多年前
Today, they number more than 10,000 species... 如今 鸟类有超过一万个物种
traveling 20 times faster than a bullet, 速度比子弹快20倍
The siblings are faster than their mother. 两只幼龙比母亲更快
Each time, more than three-quarters of all species 每一次 超过四分之三的物种
There are more than ten million species of plant and animals alive today. 如今 超过1000万种动植物 生活在地球上
Whales, bigger than any other animals that have ever lived. 鲸鱼是史上最大的动物