At the end of the last ice age, as the last glacier was receding from North America, as the last glacier was receding from North America, the ice melted and a giant pool of fresh water formed in North America.
在上个冰河时代末期 最后一块冰川从北美洲撤出 冰融化以后在那里 形成了一个巨大的淡水湖