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Of all the oceans, the Pacific is by far the largest,
縱觀世界，太平洋是目前最大的海洋
stretching almost a third of the way round the globe.
覆蓋地球周長的三分之一
It's so huge that the current in the South Pacific takes several years to complete just one cycle.
如此遼闊的海域使得洋流需要數年才能完成一次循環
In an ocean this vast, many animals have to travel huge distances to survive.
在如此寬廣的海洋中，許多動物必須跋涉千里才能生存
None more so than the sperm whale, one of the greatest voyagers on the planet.
抹香鯨便是個中翹楚，地球上最出色的航海家之一
Every year, thousands of bull sperm whales,
每年，數千頭雄性抹香鯨
some from as far as Antarctica, come to the tropics to breed.
來到熱帶繁衍后代，有些甚至來自南極
After 15 years away, fattening themselves up in colder climes,
經過寒冷水域十五年的哺育
they are now back and big enough to compete for a mate.
如今歸來，它們已經足夠強壯去爭奪配偶
These warm, equatorial waters make ideal nurseries.
溫暖的赤道海水是理想的育嬰床
At just a week old, this white calf already weighs over a tonne.
出生僅一周，這頭幼崽就已重逾一噸
For the next six years, he will stay by his mother's side,
未來六年，它會待在媽媽身邊
relaxing in these tropical waters where killer whales, his only natural predator, are rarely found.
在這片熱帶海域自在地成長，唯一的天敵虎鯨幾乎不會出現于此。
