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To the north of the steppe, in higher latitudes, lies yet another frozen world.
在草原的北部，在高緯度地區，是另一個冰凍的世界。
The boreal forest. 750 billion snow-covered trees.
北方森林。7500億棵白雪覆蓋的樹木。
It's the largest forest on Earth, encircling the top of the world from Europe to Russia, and across to North America.
它是地球上最大的森林，環繞世界之巔，從歐洲到俄羅斯，并穿越到北美。
At the far eastern end of this vast Siberian forest lies the hunting ground of one of the world's rarest big cats.
在這片廣闊的西伯利亞森林的最東端，是世界上最稀有的大型貓科動物之一的狩獵場。
The Siberian tiger.
西伯利亞虎。
Illegal hunting and destruction of its habitat have driven this tiger to the very brink of extinction.
非法狩獵和其棲息地的破壞，把這里的老虎逼到了滅絕的邊緣。
Now fewer than 500 remain in the wild.
現在只有不到500只在野外生存。
Weighing nearly 200kg, it's the largest of all the big cats.
它重近200公斤，是所有大型貓科動物中最大的。
To keep warm, this male must eat 10kg of meat a day.
為了保持體溫，這只雄性每天必須吃掉10公斤肉。
But in winter, any prey remaining here is all too easily alarmed.
在冬天，一些獵物仍然留在這里，太容易受驚了。
He must patrol his entire 700 square mile territory if he is to find enough to eat.
它必須巡邏它整個700平方英里的領土，才能找到足夠的食物。
His acute sense of smell tells him that wild pig were here.
敏銳的嗅覺告訴它，野豬在這里。
He's so hungry that he would tackle even a 150kg black bear.
它餓得連一頭150公斤重的黑熊都吃得下。
But it left here months ago, leaving only a faint trace of its scent.
但熊幾個月前就離開了這里，只留下一絲淡淡的氣味。
In the autumn, bears here escape the coming winter by hibernating inside caves.
秋天，這里的熊躲避即將到來的冬天，進入洞穴冬眠。
But that wouldn't stop a tiger from trying to catch one.
但這并不能阻止老虎試圖抓住一只熊。
Remote cameras reveal the bear's whereabouts.
遠程攝像機揭示了熊的去向。
It retreated into the farthest recess months ago.
幾個月前，它退入到最遠的隱蔽處。
The tiger is simply too big to reach it.
老虎實在太大了，進不去。
But ready for every opportunity, this big cat is able to endure the long Siberian winter.
但隨時準備把握每一個機會，這只大貓能夠忍受漫長的西伯利亞冬天。
And as long as this forest is kept free from poachers, these magnificent tigers have a good chance of surviving.
只要這片森林沒有偷獵者，這些出色的的老虎有很大的生存機會。
