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)
cottage
扦插
乡村建筑
扦插生根
村舍
平房
农宅
小屋
独立家屋
别墅
茅屋
茅舍
Cottage Resettlement Area
cottage seedling technique