"A" should only be used to refer to a single item or category, and should not be used in conjunction with plural nouns;
“A”指某一单独的事物或一个类别的事物，不应该与复数名词连用；
"A" should only be used to refer to a single item or category, and should not be used in conjunction with plural nouns;
“A”指某一单独的事物或一个类别的事物，不应该与复数名词连用；
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