that today, nearly 80% of all animals, 以至于今天将近80%的动物
In the story of life, armor has been such a success 在生命的故事中 护甲是如此成功
It's searching for one of the ancient ocean's greatest sights... 它在寻找 古代海洋中最壮观的景象之一
Despite the trilobite's armor, it makes sense to keep out of sight. 尽管三叶虫有护甲 但是保持隐蔽仍然是明智的做法
Trilobites are one of the first in a brand-new dynasty, 三叶虫 是一个全新王朝中的首批生物之一
jellyfish were entirely free of predation. 水母完全摆脱了被捕食的危险
jellyfish were the first to venture out of the shallows 水母率先冒险离开浅海
these anemones make quick work of baby jellyfish. 能够快速解决小水母
they were able to separate into layers of individuals, 但还是能够分离成数层个体层
The arrival of predation was a seismic shift in the ancient seas. 捕食者的出现 是古代海洋中的一次颠覆性转变