中国没有任何真正的中世纪式的生产城市，由此可以看出中国封建主义的贫乏性。

The meagerness of Chinese feudalism is evidenced by the absence of any real medieval productive cities.

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廉价的交通网络、城市的兴起以及资本和信用的普及都是促使工厂生产转型的因素。

Cheap transportation networks, the rise of cities, and the availability of capital and credit all stimulated the shift to factory production.

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许多城市允许消费者购买纸袋，这些纸袋很容易回收，但会消耗更多的能源来生产。

Many cities allow shoppers to purchase paper bags, which are easily recycled but require more energy to produce.

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That is to say, they don't produce food.

换言之,城市人口可以不需要生产食物

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