农业历史
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为何铁丝网——没错，就是铁丝网——与电话同样具有划时代意义
In the settling of the western US, it fenced off farm acreage and kept out grazing cattle — and made the concept of land ownership in America a physical reality.
In the settling of the western US, it fenced off farm acreage and kept out grazing cattle — and made the concept of land ownership in America a physical reality.
