hair是不是不可數名詞

hair是不是不可數名詞

做“頭髮”這個整體概念的時候,不可數.如
She wears long hair.她蓄著長髮;
強調幾根頭髮的時候,是可數的;如
There are a few hairs in the book.
書裡有幾根頭髮.