Energy Savings: Wind is a free fuel.
节能：风力是一种免费能源。
There would be free fuel for everyone.
每一个帮上忙的人都可以分得免费的燃油。
But the fuel (sunlight) is free.
但是燃料(太阳光)是免费的。
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 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。
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