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Calves born during the journey will be tested.
在旅途中出生的小牛將受到考驗。
Clues to why the herds are drawn to the Yellowstone plateau lie in its deep and unique history.
究其牛群被吸引到黃石高原的原因，其線索就深埋在其悠久的獨特的歷史當中。
This plateau is the created bowl of a huge sleeping volcano.
這是一個巨大的休眠火山所創建的碗狀高原。
And melting rock below the surface still pushes the land up to the cold of high altitude.
而且表面下的融化巖石仍將土地上升到寒冷的高海拔。
But it has not been the only force to shape the land.
但這也不是唯一塑造這片土地的力量。
Millennia ago,the volcano was covered by an ice sheet thousands of feet deep.
幾千年前,這座火山被一個成千上萬的英尺深的大冰原覆蓋。
The few glaciers that border Yellowstone are an echo of a time when ice scared and smoothed the entire plateau.
當冰使整個高原變得平軟光滑時，黃石公園的一些邊界冰川是一種時間的回聲。
注：聽力文本來源于普特
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