Young people have black____(hair) and old people have white___(one,ones)

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Young people have black____(hair) and old people have white___(one,ones)

Young people have black____(hair) and old people have white___(one,ones)
Young people have black____(hair) and old people have white___(one,ones)

Young people have black____(hair) and old people have white___(one,ones)
Hair is both singular and plural.The hair on your head refers to all the individual hairs.头发可以是单数和复数,用hair就可以代表你头发上所有的头发~
The plural for countable hair is hairs.One hair,two hairs...hair头发本身是有可数的~可以加s
But a collection of hair is hair.不过以整体来说习惯用hair
一般是通用(比如我们说脸上的毛可以facial hair/hairs)
这里用hair one

Young people have black hair, and old people have white ones.

Young people have black hair (hair) and old people have white one(one,ones)
hair 为不可数名词 后面的one 指代hair 也要用单数
年轻人是黑头发,口年人则是白色的(头发)。

hair
one
做整体讲是头发是不可数的