磨坊
磨坊用來磨穀物的地方。可分為水力磨坊、風力磨坊和動物磨坊三種。
水力磨坊
Gristmill with water wheel, Skyline Drive, Virginia, 1938
水力磨坊用水力帶動渦輪，把穀物磨出。可見於羅馬帝國時期領地和中國。
優點:用之不盡。
缺點:只限雨季。
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