![Before1840architectsandbuildersmadebuildingsfromstone,b...]( "Before1840architectsandbuildersmadebuildingsfromstone,b...")
- 问题详情：Before1840architectsandbuildersmadebuildingsfromstone,brick,orwood.Theoutsidewallshelduptheweightofthebuilding.Abuildingthathadmorethanafewstoriesbecameveryheavy.Atallbuilding,suchasacastle,hadverythickwalls.Astimewentby,architecturebegantoch...
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