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替代表泛指的复数名词，通常用 ones.如：Hard beds are healthier than soft ones.硬板床比软床有利于健康.Green apples often taste better than red ones.青苹果往往比红苹果好吃.We can lend you plastic chairs or metal ones.我们可以借给你塑料椅子或者金属椅子.These chairs have the great advantage of being much cheaper than conventional ones.这些椅子具有比普通椅子便宜得多的优势
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