求翻译：良好的社会效益与经济效益显示出电动教练车项目有着巨大的市场需求，保守估计，全国用于驾驶培训的燃油教练车若有50%改为电动教练车，有不小于20亿元的庞大市场，何况还有其无法估计的增值服务、售后服务和国外市场可以进行开发。是什么意思？

Good social and economic benefits shows that electric car project coach has a huge market demand, a conservative estimate, the national coach for the drive train of the fuel to electric cars if 50% of the coach cars, with not less than 20 million large market, not to mention there is not possible to

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The good social efficiency and the economic efficiency demonstrated the electrically operated driver training car project has the giant market demand, the conservative estimate, the nation uses in driving training the fuel oil driver training car if has 50% to change the electrically operated driver

Social and economic benefits of good shows electric coach car project has a huge market demand, a conservative estimate, national fuel used for driving training coach car if so 50% changed to electric coach car, there are huge and not less than $ 2 billion market, let alone also has incalculable val

Social and economic benefits of good shows electric coach car project has a huge market demand, a conservative estimate, national fuel used for driving training coach car if so 50% changed to electric coach car, there are huge and not less than $ 2 billion market, let alone also has incalculable val