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关注：1
2013-05-23 12:21
求翻译：There seem to have been several periods within the last tens of thousands of years when water accumulated in these basins. The rise and fall of the lakes were undoubtedly linked to the advances and retreats of the great ice sheets that covered much of the northern part of the North American continent during those times是什么意思？ 待解决
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- 离问题结束还有
There seem to have been several periods within the last tens of thousands of years when water accumulated in these basins. The rise and fall of the lakes were undoubtedly linked to the advances and retreats of the great ice sheets that covered much of the northern part of the North American continent during those times
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2013-05-23 12:21:38
目前似乎已经在多年的最后数万几个时期，当水积聚在这些盆地。
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2013-05-23 12:23:18
似乎有几个期间已在过去的数十年的数以千计的水时,这些盆地积累。 的上升和下降的湖泊,无疑是与禅的进步和巨大的冰原,涵盖很多的北部,北美大陆在这些时期。
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2013-05-23 12:24:58
当水在这些水池时，积累了看起来在为时之内似乎几个期间成千上万岁月。 湖的上升和秋天与在那些时期，盖许多北美洲大陆的北部伟大的冰床的前进和撤退无容置疑地连接了。
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2013-05-23 12:26:38
There seem to have been several periods within the last tens of thousands of years when water accumulated in these basins.The rise and fall of the lakes were undoubtedly linked to the advances and retreats of the great ice sheets that covered much of the northern part of the North American continent
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2013-05-23 12:28:18
在那里好象是水在这些盆地积聚的去万的年中的若干时期。湖的起起落落无疑到预先被连接和包括的大的冰原的撤退大部分在那些时期期间的北美大陆的北部。
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