rural-urban (urban-rural) continuum
Coalition Fighting for Rehousing of Urban Squatters in Urban Areas
urban-rural (rural-urban)continuum
Changing flat roof to slope roof
diagonal ridge for hip roof，vertical ridge for gable roof
flat- roof-to- slope-roof
flat-roof-to-slope-roof
flat-roof-to-sloping roof
roof pressure roof weight
roof prism (=roof-angle prism)