haircut n.剪头发; 理发;
I see you've had a haircut.
我看得出你理发了。
I need a haircut.
我要理发了。

女生发型的常用表达：
I wear my hair loose/down.
我把头发散开。

braid n.辫子 v.编辫子
I'd like to wear braids.
我喜欢编辫子。
I'm going to braid my hair.
我要把头发编起来（编辫子）。

ponytail 马尾辫
I'm going to wear a ponytail.
我要扎个马尾辫。

bun 丸子头；发髻
I'm going to put my hair in a bun.
我要把头发盘起来。
She wore her hair in a bun.
她扎了个丸子头。
Do I look cute with a bun?
我扎丸子头可爱吗？

男生发型的常用表达：
crew cut 平头
Did you see the crew-cut man？
你看到那个留平头的男人了吗？

slicked back 背头
His hair was slicked back.
他的头发用了发胶，往后梳得平平整整的。