a number of和an amount of的区别?

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a number of和an amount of的区别?
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a number of和an amount of的区别?
a number of和an amount of的区别?

a number of和an amount of的区别?
an amount of通常与不可数、无生命的名词连用.如:She spent a very large amount of money yesterday.她昨天花了好大一笔钱.a number of与可数、有生命或无生命的名词连用.如:The president has made a large number of mistakes.总统已犯了许多错误.an amount of一般是指某个物体的的多少,一般用an large amount of等.the amount of一般是某个物体的具体的数量,后面一般加名词.a number of与an amount of的意思差不多,但一般后面加群体性的名词,如:people.the number of也和the amount of差不多,也是后面一般加群体性名词