The villages and towns were usually perched on the edge [of the farms] so as not to waste arable soil and because there was a ne

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问题 The villages and towns were usually perched on the edge [of the farms] so as not to waste arable soil and because there was a need, before the High dam tamed the Nile, to live beyond the reach of the annual floods.

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答案为了不浪费可耕地,村庄和小镇通常建在田边上;另一个原因是,在没建尼罗河大坝以前,人们要住得离河道远一点,以躲避每年发生的洪水。

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