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北美五大湖 [běi měi wǔ dà hú]
great lakes
- 当冰层数千万年前覆盖加拿大和北美五大湖时，地球的重力将他们从地表向下拉，从而引起下沉。
Well, when glaciers covered Canada and the northern Great Lakes tens of thousands of years ago, their weight pushed down on the Earth's surface and caused it to sag. - 嗯，当几万年前冰河覆盖加拿大和北美五大湖北部的时候，他们的重量挤压地球的表面，使地球下沉。
Well, when glaciers covered Canada and the northern Great Lakes tens of thousands of years ago, their weight pushed down on the Earth's surface and caused it to sag. - 所以加拿大的土地和北美五大湖缓缓上升，而北美其余部分却慢慢下降，好象秋千一样，让覆盖物流回北部。
So the land in Canada and the northern Great Lakes is slowly rising, while the rest of North America is slowly sinking, like a seesaw, enabling the mantle to flow back north.
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