diamond 单复数均可,要看具体语境
像你这个例子就是钻石作为一个体有很多碳原子组成
Diamond is the hardest known substance
这个例子就是把钻石看成一个整体,和其他物体比
diamond are made from carbon钻石由碳组成,are 是否应该用单数还是都可
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