- and into the big blue.
进入巨大的蓝色海洋 - Here, with fish yet to evolve,
在这里 鱼类尚未进化 - jellyfish were entirely free of predation.
水母完全摆脱了被捕食的危险 - In time, others would follow.
随着时间的推移 其他生物也会跟随而来 - But more than half a billion years ago,
但是五亿多年前 - the open ocean belonged to them.
广阔的海洋属于它们 - For those still stuck on the seabed,
对于那些仍困于海床上的生物来说