Oil fuels transportation and farm machinery, and natural gas is the basis of synthetic nitrogen production (prices have tripled since 2002).
粮食运输以及农业机器都需要石油，合成氮肥(2002年以来价格已经增长2倍)生产离不开天然气。
It provides the basis theory for optimization design of grain processing and transportation equipment, the food processing machinery and the farm machinery design and the improvement.
为粮食加工输送设备的优化设计，食品加工机械、农业机械的设计和改进提供理论依据。
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