- Pushing through deep snow is exhausting work,
在厚厚的积雪中行动非常耗费体力 - and the bison are now slowly starving.
美洲野牛越来越饥饿 - Just keeping warm saps huge amounts of energy.
仅仅保暖都需要耗费大量的能量 - Their thick coats can insulate them down to minus 20 Fahrenheit.
他们厚重的皮毛可耐受零下三十度的低温 - It's now minus 40.
现在是零下四十度 - The only thing that will keep them alive
唯一能让他们活下去的食物 - is buried beneath three feet of snow.
被深埋在一米深的积雪之下
Their thick coats can insulate them down to minus 20 Fahrenheit. 他们厚重的皮毛可耐受零下三十度的低温
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