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
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