hair 头发
hair
既可作可数名词,
又可作不可数名词.
用来描述人时,
通常取不可数名词的意
思,如：
She has long blonde hair and blue eyes
（她有着长长的金发和蓝色的
眼睛）,
the girl with red hair and freckles
（一头红发面带雀斑的女孩）.但
如果要特指头上或身上的某一缕或几缕毛发,
就取可数名词的意思,
如：
There were some blonde hairs in the car
（车里有几根金发）,
a single fibre thinner than a hair
（一根比头发丝还要细的纤维）
