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a variety of 和 varieties of的区别?

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a variety of 和 varieties of的区别?
在Longman中的答案:
a variety of something:a lot of things of the same type that are different from each other in some way,e.g.
The girls come from a variety of different backgrounds.
variety of:a type of thing,such as a plant or animal,that is different from others in the same group,e.g.
The lake has more than 20 varieties of fish.
a variety of 和varieties of后面只加可数名词的复数形式,两者没什么区别,意思是“各种各样的……”