He found a gary hair on his head.为什么用a如题

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He found a gary hair on his head.为什么用a如题
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He found a gary hair on his head.为什么用a如题
He found a gary hair on his head.为什么用a
如题

He found a gary hair on his head.为什么用a如题
这里是 一根头发 的意思 所以是可数的

hair,
做“头发”这个整体概念的时候,不可数 。如
She wears long hair.她蓄着长发;
强调几根头发的时候,是可数的;如
There are a few hairs in the book.
书里有几根头发。

这里的a指的是“一根”,因此是可数的

强调一根,可以用单数的

嗯,这里强调,在头上发现了一根白头发,所以在这个时候,头发就可以数的过来了,所以前面可以加a