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Even the mastodon is buried here, a long dead relative of modern elephants.
甚至連乳齒象都被埋在這里，
This was once a bear, but not like any bear in North America today.
這里曾經(jīng)有熊，但是和如今的北美大陸的熊是有區(qū)別的。
Claw marks gouged into the cave wall showed the bear was not killed direct by the fall. It made a desperate attempt to climb back out.
山洞墻壁上挖鑿的爪印顯示出熊并非死于直接墜亡。它曾絕望地想爬出這個山洞。
It was a short-faced bear, an ice age heavyweight.
這是只短面熊，冰河時期的重量級人物。
What else can we tell about it from its bones? Its weight was more than 700 kilos, twice that of a grizzly bear today.
從這些骨頭中我們還能了解到什么呢？它的重量超過700公斤，是今天灰熊的兩倍。
Upright, it would've stood four meters tall. It was the largest flesh-eating mammal that ever walked the earth.
它直立的時候有四米高，也是有史以來最大的食肉哺乳動物。
The Wyoming cave, appropriately christened natural trap, provides a unique window of the Ice Age.
被命名為自然陷阱的懷俄明洞穴，為探究冰河世紀(jì)打開一扇門。
During its coldest era, much of North America was covered by huge ice sheets up to two miles thick, but as the continent began to warm, the ice sheets started shrinking.
在最寒冷的時期，北美的很多地方被厚達(dá)兩英里的巨大冰塊覆蓋著，但是隨著大陸逐漸變暖，冰蓋開始減小。
Corridors began to open up along the coast and through the mountains, letting people migrate south from Alaska for the first time.
沿著海岸，穿過山脈，一條條通道顯現(xiàn)出來，人們第一次從阿拉斯加向南遷移。
Before them lay the almost limitless great plains stretching all the way from the Rocky Mountains to the Mississippi River and beyond to Mexico.
他們的面前是一望無際的大平原，一直從落基山脈延伸到密西西比河，越過了墨西哥。
Across this area, the shifting ice left deep scars on the land.
在這個區(qū)域，大塊的浮冰運(yùn)動在陸地上留下深深的印記。
They carved out thousands of lakes and ponds, and left the tapestry of streams and rivers that drained the plains.
它們刻畫出成千上萬的湖泊和池塘，勾勒出平原上如畫般的溪流和小河。
