of which we see only the surface, 知道些什么

5. The city merely follows the model of wealthy nations.
   迪拜仅仅是学发达国家而已
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

来自《家园 第二部分 Home Part2》第 8 行