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the+“单可”表泛指一类,与a+“单可”表泛指一类,有什么区别?

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the+“单可”表泛指一类,与a+“单可”表泛指一类,有什么区别?
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答案和解析
“the + n单数=a + n单数”,指一类时是意思相等的.如
The horse runs fast.
=A horse runs fast.
=Horses run fast.
不是指一类时,the + n单数表示特指,a + n单数表示泛指.
如:
The book is worth reading.
A book is our friend.