Trade was the mainstay of the urbaneconomy in the Middle East, as caravans negotiated the surrounding desert, restricted only by access to water and by mountain ranges.
因为商队只能通过水路和山脉进入沙漠，贸易就成为了中东城市的主要经济支柱。
2
Researches focusing on regional and urbaneconomy.
主要从事区域和城市经济方面的研究。
3
The urbaneconomy is growing, but not by that rate.