The villagers and towns were usually perched on the edge, so as not to waste arable soil and because there was a need to live beyond the reach of the annual floods.
这里and because为什么可以这么用?
主句后接二个状语:一个不定式短语作目的状语,一个原因状语从句,分别解释为什么会有主句这种情况。二个状语用并列连词and连接。
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