hair這個詞既可以是可數(shù)名詞,也可以是不可數(shù)名詞,只是含義稍有變化：
1.作為可數(shù)名詞,是指一根一根的“頭發(fā)”或“毛發(fā)”：
Look at this,a hair in my soup.你瞧,我的湯里有根頭發(fā).
The cat has left her loose hairs all over my clothes.貓掉的毛弄得我衣服上到處都是.
My father has quite a few gray hairs.我父親已有不少白發(fā).
There is not a gray hair on his head.他頭上沒有一根白頭發(fā).
2.作為不可數(shù)名詞“頭發(fā)”的總稱,是集合名詞：
I’ll have my hair cut.我要去理發(fā).
He has blond hair.他有一頭金發(fā).
She has a beautiful head of hair.她有一頭漂亮的頭發(fā).
The woman likes to do her hair in foreign style.這個女人喜歡把頭發(fā)梳成外國式.