■ 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？

• north of
• north 与 northern
• not
• not
• not
• not...because
• no thanks
• nothing
• nothing if not
• notice
• not only but
• not only...but
• not only but also
• not so much as
• not so much...as
• not so much as... 与 not so much... as...
• not to
• not to inf. 与 to not inf.
• not to say
• not without
• not所否定的范围
• novel
• now
• no 与 not
• no 与 yes