The evidence suggests it took them, only 1,000 years to spread across the entire northern continent.

据考证，它们只花了一千年时间就传遍了整个北方大陆。

Stretching across the entire northern continent, this desert is larger than all the others  combined.

这片沙漠横跨整个北部大陆，比其他所有沙漠的总面积还要大。

During the Triassic Period, the supercontinent of Pangea was just beginning to drift apart into a northern and southern continent.

在三叠纪时期，盘古大陆刚刚开始漂移成南北大陆。

The two northern continents of North America and Eurasia form most of the land area of this biome with the great plains of their heartlands being made up of prairie and steppe.

北美和欧亚大陆的两个北部大陆构成了这个生物群落的大部分陆地面积，其中心地带的大平原由草原和草原组成。