All together they constitute a mere eight percent of the world's oceans 尽管浅水域仅仅占据了8%的海洋

1. Our planet's continents are fringed by shallow seas.
   我们陆地的边缘都是浅海域
2. Rarely more than two hundred meters deep they lie on the continental shelves which may stretch sometimes for hundreds of miles
   它们挨着大陆架 很少地超过200米深, 大陆架有时可能延伸达几百英里
3. before the sea floor drops into deeper darker waters.
   再往下就是漆黑的深渊
4. All together they constitute a mere eight percent of the world's oceans
   尽管浅水域仅仅占据了8%的海洋
5. but they contain the vast majority of it's marine life.
   不过大多数的海洋生物都生活在这里
6. A male humpback whale sings to attract a mate.
   一只雄性座头鲸正在用歌声吸引雌鲸来交配
7. The whales have just returned to their breeding grounds in the shallow seas of the tropics.
   座头鲸刚刚回到它的热带地区的浅海繁殖地

来自《行星地球 第一季 第九集 Planet Earth S01E09 海洋》第 4 行