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Not all food is stored. Some is needed right now.
不是所有的食物都要儲藏起來。有些馬上就要吃。
She has seven hungry cubs to feed.
這只母狐貍有七只饑餓的小狐貍要喂養。
As their appetites grow, the mother must work tirelessly to raise her family.
隨著小狐貍胃口不斷增加，母狐貍必須拼命覓食才能養活全家。
Only fat, healthy cubs will survive the Arctic winter.
同時只有健康、飽滿的小狐貍才能捱過北極的寒冬。
The vast majority of the goslings are still flourishing.
成千上萬的小雪雁還在茁壯成長
Their parents lead them down to the safety of the water as soon as they're strong enough to make the journey.
它們強壯得可以旅行時，父母馬上就帶著它們來到更為安全的水域。
For the foxes, boom time has come to an end.
對于狐貍來說，美好時光已經接近尾聲。
But the mother has given her cubs the best possible start in life.
但是母親已經給了它們一個最好的開端。
The geese will continue grazing the tundra until the summer ends and they're forced to head south for the winter.
雪雁還將一直在苔原上吃草，直到夏天結束，它們才會被迫南遷過冬。
At these latitudes, the sun's rays are weak and grass can only grow here for a few months a year.
在這樣的高緯度，陽光的強度非常微弱，這里的草兒只有幾個月的生長期。
But further south, summers are longer and the grasslands flourish.
但是在更遠的南邊，夏天的時間更長，草原更加茂盛。
