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sociology bangladesh urban urban poverty sociology of poverty rural ruralurban urbanpoverty symbolism symbolism significance significance urban olanning ecocity environment future functions industrial sociology trade union features underdevelopment in bangladesh cycleofunderdevelopment colonialera colonialexpansion 别虫辫补苍蝉颈贸苍 process underdevelopment #colonialism poverty urban poor poor urban migration urbanization causes of urban poverty dimensions dimenions of urban poverty overview of urban poverty rural urban migration urban poverty in bangladesh education