The Laurentide ice sheet retreated and left mass amounts of water in the basins the glacier had carved thus making the great lakes.
劳伦·泰德冰盖退却，在冰川雕刻的盆地里留下大量的水，从而形成大湖。
The Laurentide ice sheet retreated and left mass amounts of water in the basins the glacier had carved thus making the great lakes.
劳伦·泰德冰盖退却，在冰川雕刻的盆地里留下大量的水，从而形成大湖。
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