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Our planet's continents are fringed by shallow seas.
我們陸地的邊緣都是淺海域。
Rarely more than two hundred meters deep they lie on the continental shelves
它們挨著大陸架，很少地超過200米深，
which may stretch sometimes for hundreds of miles before the sea floor drops into deeper darker waters.
大陸架有時可能延伸達幾百英里，再往下就是漆黑的深淵。
All together they constitute a mere eight percent of the world's oceans
盡管淺水域僅僅占據(jù)了8%的海洋，
but they contain the vast majority of it's marine life.
不過大多數(shù)的海洋生物都生活在這里。
A male humpback whale sings to attract a mate.
一只雄性座頭鯨正在用歌聲吸引雌鯨來交配。
The whales have just returned to their breeding grounds in the shallow seas of the tropics.
座頭鯨剛剛回到它的熱帶地區(qū)的淺海繁殖地。
The calf is no more than a few weeks old.
幼鯨才剛剛幾周大。
Despite being three meters long and weighing nearly a ton, he is nonetheless vulnerable.
雖然已經(jīng)三米長，一噸重，還是比較虛弱，也容易受攻擊。
But his mother watches over him
不過幸好有媽媽照料，
and, as he begins to tire, she supports him close to the surface so that he can breathe more easily.
疲勞的幼鯨被媽媽托上浮上水面好讓它呼吸空氣。
