是un
这里 ivory 属于“物质名词”,不可数
类似的有：
The desks are made of wood.
we must save the trees and not buy things made of ivory
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we must save the trees and not buy things made of ivory意思
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we must save the trees and not buy things made of ivory.中的“
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save ,the,we,trees ,must,ivory,made of,things
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