The ocean depths remain a secret. 海洋的深度仍是个谜

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
13. From 18 to 100 million metric tons a year.
    年捕捞量从1800万吨♥涨到1亿吨♥

来自《家园 第二部分 Home Part2》第 10 行