where thousands come together to breed. 数以千计的三叶虫来到这里繁衍后代
But away from the canyons, there's nowhere to hide... 但是由于远离峡谷 无处可藏
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
jellyfish were the first to venture out of the shallows 水母率先冒险离开浅海
they were the very first animals to escape the seafloor and swim. 它们是第一种从海底逃离 并开始游泳的生物
they were able to separate into layers of individuals, 但还是能够分离成数层个体层