hair和hairs的区别
没有区别，hairs是hair的复数。
n.毛发;(尤指)头发;有…毛发(或头发)的;(植物叶茎上的)茸毛
例句
What a difference! You look great with your hair like that.
真是判若两人！你梳这种发型显得太帅了。
Did she use to have long hair?
她过去留长发吗？
Don\'t split hairs. You know what I\'m getting at.
别钻牛角尖了。你知道我指什么。
He was afraid the dog\'s hairs might dirty the seats
他担心狗毛弄脏了座位。