Later, some of their tribes migrated to the region that is currently southern Siberia and settled along the Yenisei River, where they lived from the 6th until the 8th centuries.

稍后一些时候，他们部落的一些人迁徙到了现在西伯利亚的南部地区并且沿着叶尼塞河定居下来。从六世纪到八世纪一直居住在那里。

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Only a tiny segment of the Qin wall remains, which was a reinforced earth barrier unlike the imposing stone structure built by the Ming Dynasty some twelve centuries later.

秦朝长城现仅存一小段，秦朝长城是用土坯加固的，不像12个世纪后的明朝修建的长城是石头结构的。

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Pollen and ash remains show that 2000 years ago the Mayans were growing maize with slash-and-burn agriculture in some areas that over the course of later centuries became permanently flooded wetlands.

从遗留的花粉和草木灰可看出距今2000年前生活在那里的玛雅人还在那里种植玉米，虽然种植方式还处在刀耕火种的原始方式，但那里毕竟还有土地。可是在随后的几百年里，这片土地已成了永久性的洪涝之地。

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