The marginal cost of producing wind power is almost nothing, since the fuel—wind—is free.
因为风是免费燃料，所以风能的边际成本几乎为零。
The Pearl Street station began producing power in 1882.
珍珠大街发电站在1882年开始发电。
They utilized water for producing electric power.
他们利用水力发电。
The power of producing wealth is therefore infinitely more important than wealth itself;
由此可见，财富的生产力比之财富本身，不晓得要重要到多少倍；
The power of producing wealth is therefore infinitely more important than wealth itself;
由此可见，财富的生产力比之财富本身，不晓得要重要到多少倍；
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