■ 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？

• for
• for all that
• forbid
• forbid 与 prohibit
• forecast
• forever
• forget
• forgive
• for granted
• for that matter
• for...to
• forward
• for 与 in
• for 与 until
• found
• free
• free
• free love
• free 与 flee
• French
• freshman
• friend
• friendly
• from
• from