No one could raise crops on this barren land.
没人能够在这么贫瘠的土地上种庄稼。
It is different from settled farming because shifting cultivators raise crops in a place for only as long as the soil allows the crops to grow well.
它不同于固定的耕种,因为轮作耕种者在一个地方种庄稼的时间长短要视那里的土壤适合庄稼生长的时间而定。
By about 6000 BC, people had discovered the best crops to grow and animals to raise.
大约在公元前6000年,人们已经发现了最适宜种植的庄稼和最适宜饲养的牲畜。
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