Not until the 1920s when cars and trucks became affordable and roads improved, did migratory beekeeping begin to catch on.

直到19世纪20年代当汽车和卡车比较经济和道路改善，迁移养蜂开始流行。

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Not until the 1920s when cars and trucks became affordable and roads improved, did migratory beekeeping begin to catch on.

直到19世纪20年代当汽车和卡车比较经济和道路改善，迁移养蜂开始流行。

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