求翻译：目前针对电动汽车环保经济效益的研究较多[3,4]。文献[5]从Logistic模型入手对未来全球电动汽车市场进行了预测和分析；文献[6]采用弹性系数法和千人保有量法建立电动汽车保有量预测模型，预测电动汽车发展趋势；文献[7]从国内外两个方面介绍了电动汽车的发展状况，并对未来电动汽车数量进行了相关预测；文献[8]从电网企业角度出发，对未来北京地区电动汽车的电量需求、负荷需求进行了预测分析。是什么意思？

The current environment for electric vehicles are more cost-effective research [3,4]. [5] starting from the logistic model for the future of the global electric vehicle market forecasting and analysis; [6] and the elastic coefficient method was established by thousands of people ownership of electri

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Current study on the economic benefits of environmental protection for electric vehicles more [3,4]. Literature [5] from Logistic model starting with on future global electric vehicle market for has forecast and analysis; literature [6] used elastic coefficient method and thousand people maintains v