And which covers three-quarters ofthe planet? 而它占据了地球表面的四分之三

6. We haven't understood that we're depleting what nature provides.
   我们并不理解我们正耗尽自然的给予
7. What do we know of the marine world,
   我们对只能看到表面的海洋世界
8. of which we see only the surface,
   知道些什么
9. And which covers three-quarters ofthe planet?
   而它占据了地球表面的四分之三
10. The ocean depths remain a secret.
    海洋的深度仍是个谜
11. They contain thousands of species whose existence remains a mystery to us.
    在它之中的上千种生物仍然是个谜
12. Since 1950, fishing catches have increased fivefold,
    自1950始 海洋捕捞增长了5倍

来自《家园 第二部分 Home Part2》第 9 行