他们使用武力把土著居民驱逐出了比较肥沃的土地。They used force to banish the natives from the more fertile land.现在是肥沃土地的地方在很久很久以前曾是一片片沙漠。Aeons ago, there were deserts where there is now fertile land.这会让肥沃的土壤暴露在外，使其容易受到侵蚀。This leaves fertile soi...
当然，识字和智力是两码事。Of course, literacy isn't the same thing as intelligence.小孩子识字的速度不同，这不足为奇。It is not surprising that children learn to read at different rates.6个月后，约翰已经渐渐能够识字和算数，也有了自信。Six months later John had developed...