新托福词汇分类突破

1.Basicbuildingmaterialsinclude:timber,mud,stone,marble,brick,tile,steel,and cementconcrete.Masonrywallsarebuiltwithstonesorbricks,coheredthroughthe useofmortar,firstcomposedoflimeandsand.Theprofusionofaluminumandits anodizedcoatingsprovidedcladdingmaterialt