hair 美 [her] 英 [heə(r)]
n. 头发；毛发；vt. 除去…的毛发；
vi. 生长毛发；形成毛状纤维；adj. 毛发的；护理毛发的；用毛发制成的
hair的复数形式：hairs；形容词：hairy；名词：hairiness
常见搭配+例句：
long hair 长头发
My mother has beautiful long hair.
我的妈妈有一头漂亮的长发。
white hair 白发
She suddenly noticed that her mother has several strands of white hair sticking out in contrast on her brunette head.
她忽然注意到她妈妈有几根白发从满头的棕色头发中显露出来。
cut hair 理发
"Why do you cut hair outdoors? " I asked " Is it too expensive to rent a shop? "
“你为什么在室外理发呢，租个店很贵吗？”我问他。
brush hair 梳头发
After washing, starting from the bottom , gently brush hair using a downward motion and gradually move up until all of the hair is brushed.
清洗过之后，从底部开始，轻轻地向下梳头发，并且逐渐向上使整个发片都被梳理到。
注：
hair指“(人、动物的)毛，茸毛，汗毛”时是可数名词，可与数词连用表示具体数量(如几根)，也可用a few，many， several等修饰表示不定数量。
hair泛指“头发”时，指人的整个头发，是集合名词，不可数。