- The polar seas in summer are the most productive on the planet
夏季的极地海域是地球上最多产的 - and the whales gorge themselves round the clock.
鲸鱼昼夜不停地在此进食 - The fat reserves they lay down now
它们现在积累的脂肪 - will keep them alive during the year to come
可以支持到明年再来 - but it may not always be this way.
不过也可能不会再来了 - Fish and krill stocks are declining so rapidly that spectacles like this may soon be part of history.
鱼和磷虾的产量正在迅速减少 象这样的景象可能很快将成为历史 - Once the mother and calf have reached their feeding grounds, they will separate.
一旦母鲸和小鲸到达他们的给养地 它们就要分开
will keep them alive during the year to come 可以支持到明年再来
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