Calves born during the journey will be tested.
在旅途中出生的小牛将受到考验Yrajd^K~N=jjY&。
Clues to why the herds are drawn to the Yellowstone plateau lie in its deep and unique history.
究其牛群被吸引到黄石高原的原因，其线索就深埋在其悠久的独特的历史当中_*3qWYR)|;。
This plateau is the created bowl of a huge sleeping volcano.
这是一个巨大的休眠火山所创建的碗状高原O~PIy[~4%0Q。
And melting rock below the surface still pushes the land up to the cold of high altitude.
而且表面下的融化岩石仍将土地上升到寒冷的高海拔5C4XrFOe.6NgQT.=。
But it has not been the only force to shape the land.
但这也不是唯一塑造这片土地的力量]nKU,,EF;9AG。
Millennia ago,the volcano was covered by an ice sheet thousands of feet deep.
几千年前,这座火山被一个成千上万的英尺深的大冰原覆盖VSGVO5=#QAa2l|yP6。
The few glaciers that border Yellowstone are an echo of a time when ice scared and smoothed the entire plateau.
当冰使整个高原变得平软光滑时，黄石公园的一些边界冰川是一种时间的回声~o1w|*Vq.U-nhqy。

注：听力文本来源于普特

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