- the prairies of North America begin to freeze.
北美的草原开始霜冻 - In summer, bison roamed freely,
夏季 美洲野牛四处漫步 - almost continuously cropping the abundant green grass.
享用着取之不尽的大片青草 - Now, that grass is not only withered and frozen,
现在青草不仅枯萎结冰 - it's about to be buried.
马上还会被大雪掩埋 - Sixty million tons of snow now blanket this herd's territory.
六千万吨的积雪覆盖在野牛群的领地上 - Pushing through deep snow is exhausting work,
在厚厚的积雪中行动非常耗费体力