economy run汽车节油行驶竞赛economyn.经济；节约adj.经济的；廉价的economy in hygiene卫生经济economy growth pole经济增长极economy of the West西部经济Economy urge factor经济驱动因素economy of regional区域经济economy dcvelopment经济发展economy feasibility经济可行性economy growth rate经济增长率economy mathematics经济数学economy differences经济差异