評(píng)論
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In summer, bison roamed freely, almost continuously cropping the abundant green grass.
夏季，美洲野牛四處漫步，享用著取之不盡的大片青草。
Now, that grass is not only withered and frozen, it's about to be buried.
現(xiàn)在青草不僅枯萎結(jié)冰，馬上還會(huì)被大雪掩埋。
Sixty million tons of snow now blanket this herd's territory.
六千萬噸的積雪覆蓋在野牛群的領(lǐng)地上。
Pushing through deep snow is exhausting work, and the bison are now slowly starving.
在厚厚的積雪中行動(dòng)非常耗費(fèi)體力，美洲野牛越來越饑餓。
Just keeping warm saps huge amounts of energy.
僅僅保暖都需要耗費(fèi)大量的能量。
Their thick coats can insulate them down to minus 20 Fahrenheit. It's now minus 40.
他們厚重的皮毛可耐受零下30度的低溫。現(xiàn)在是零下40度。
The only thing that will keep them alive is buried beneath three feet of snow.
唯一能讓他們活下去的食物被深埋在一米深的積雪之下。
And that's a problem shared with a surprising neighbour.
他們意想不到的鄰居也面臨著同樣的問題。
The food the fox seeks is also deep beneath the snow.
狐貍在搜尋的食物也被深埋在積雪之下。
The survival of both creatures depends on getting through to the ground.
這兩種生物能否生存下去，取決于能否挖到地面的食物。
