threshold of urban economic development

• 城市经济发展

threshold of urban economic development的用法和样例：

例句

1. As one of important facilities in a city, it is a commonweal cause necessary for the economic development and the people's living.
   城市公共交通已成为城市重要的基础设施之一，是城市经济发展和人们生活所必须的公益性事业。