【Key words】 Agricultural Research； Allocation & Optimization； Cost Substitution； Competitiveness of Agricultural Research；
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通过使用玉米乙醇作为替代，汽油的成本将会降低，因为现在化石燃料的进口税已经计算在价格中了。
By using corn ethanol instead, the cost of gas will decrease because now the import taxes on fossil fuels are calculated into the price.
13世纪后期，意大利的玻璃制造商发现了成本更低廉的替代方案。
Late in the 13th century, glass makers in Italy came up with a less expensive alternative.
因为替代成本仅仅是利润的一部分，所以净利润更高。
Since replacement costs are only part of the profits, net profits are higher.
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