■ hair

通常是不可数名词，只用单数。

• His hair is black.他的头发是黑色的。

但是也可以作为可数名词指一根根的头发。

• So why has he got two blonde hairs on his jacket?那么为什么他外套上有两根金色头发呢？

• mature 与 expire
• may
• may
• may not
• may 与 can
• may 与 might
• mean
• mean
• means
• meant
• measure
• meat
• meat
• meat 与 flesh
• media
• median
• medicine
• meet
• meet with
• meet 与 meet with
• memory
• mere
• merit
• method
• middle age