評論
打印
Much of the northern hemisphere is covered by ice sheets up to one and a half miles thick.
北半球多被厚達2.5公里的冰層覆蓋。
With trillions of gallons of water locked up as ice, sea levels fall.
數萬億加侖的水凝結成冰，海平面下降。
A strip of land emerges from the ocean between Siberia and Alaska.
一塊土地出現在西伯利亞與阿拉斯加之間的海洋，
It's a bridge between two vast continents, a gateway that takes humans from Asia to a new world, the Americas.
它是連接兩塊大陸的橋梁，這個通道使人類從亞洲進入一個新世界，即美洲。
They're the last great continents to be colonized,
這是最后一塊未被殖民的大陸，
the last great human migration,
最后一次人類大遷徙，
and the first Americans.
也是第一批美洲人。
Now, 14,000 years ago, the changes that triggered the ice age reverse.
14000年前，引發冰河時期的變化逆轉，
As the ice retreats, it reveals a very different northern hemisphere.
冰融化后露出截然不同的北半球，
The huge depressions that the glaciers create fill with water to become North America's Great Lakes.
冰河挖出巨大洼地，填滿水后成為了北美的五大湖。
6,000 years ago, the ice retreats back to the poles, toward the Arctic and Antarctic.
6000年前，冰退回到北極與南極。
