economy jet省油量孔economyn.经济；节约adj.经济的；廉价的economy of concentration集中经营的经济节约economy operation system经济运行机制economy carrying capacity经济承载力economy development grade经济发展层次economy of the hinterland腹地经济economy development level经济发展水平economy-type carbureter省油汽化器economy at county-level县域经济economy in mountain areas山区经济economy of Jilin Province吉林省经济