Before1840architectsandbuildersmadebuildingsfromstone,b...
问题详情：Before1840architectsandbuildersmadebuildingsfromstone,brick,orwood.Theoutsidewallshelduptheweightofthebuilding.Abuildingthathadmorethanafewstoriesbecameveryheavy.Atallbuilding,suchasacastle,ha...