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[探索发现] 走进神秘的落基山脉第13期:揭开冰川的秘密
听力原文从上一期安德森细致的观察中发现一些痕迹,我们知道了这里曾经存在过冰川,并且这些冰川对于落基山脉今天的样子起了很大的作用,那它是怎样起的作用,走进今天的落基山,听一听!For the last few million2011-12-26 编辑:Daisy
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2011-12-26 编辑:Daisy