اﳌﺸﻜﻼتﺟﺘﻤﺎﻋﻴﺔاﻟﻨﺎﺟﻤﺔﻋﻦ ﺣﻴﺎءاﻟﺮﻣﺎدﻳﺔﺑﺎﳌﺪناﺪﻳﺪةوﺗﺄﺛﺎﻋاﻟﺘﻨﻤﻴﺔاﳌﺴﺘﺪاﻣﺔ Social problems arising from gray neighborhoods in new cities and their impact on sustainable development