we must save the trees and not buy things made of ivory

问题描述:

we must save the trees and not buy things made of ivory
2个回答 分类:英语 2014-10-19

问题解答:

我来补答
是un
这里 ivory 属于“物质名词”,不可数
类似的有:
The desks are made of wood.
 
 
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补充回答:

我们必须保护树木,不购买象牙制作的物品。
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