They provide the only food and water to sustain the family. 嫩叶提供了这个家庭唯一的食物和水
Never have those wildernesses been as fragile and as precious as they are today. 大自然从未像现在一样 脆弱而又珍贵
They take many tons of water into their ballooning throats in a single gulp and sieve out what it contains. 它们一口可吃进几吨的海水 然后再过滤出想要的东西
Despite their great size, we still have little idea of where they travel in the vast oceans 撇开体积不论, 我们仍然不知道它在这广袤的海洋中去哪里旅行
and none at all of where they go to breed. 也不知道它们去哪里繁殖
To survive, they must find prey daily 为了生存,它们必须每天寻找猎物
They will only use just enough energy to make their kill 它们只用恰到好处的力量来猎杀
return to the very same beach where they were hatched. 回到它们孵化过的海滩上繁殖
How they find their way back across thousands of miles of open ocean, 它们如何从1000英里外再次赶回
They must get to the sea as soon as possible 它们必须尽快爬向大海