Staying in the ocean and evolving in the ocean for 2 billion years, finally came out onto the land. And then of course it had great -- much greater freedom, and a much greater variety of creatures developed on the land than had ever been possible in the ocean.
也许它已经在海洋里出现并进化了20亿年 最后就跑到陆地上 于是就有了更大的自由 也繁衍出更多种类的物种 这是在海洋里不可能发生的事情