hair相关表达

1.
short hair 短发；
long hair 长发，
straight hair 直发，
curly hair 卷发；
real hair 真发;
wig/fake hair 假发。
除了头上长的以外，身体上的毛发也叫 hair, 比如 chest hair 胸毛，还有 nose hair, leg hair.... hairremoval 脱毛，hairaccessories 头饰
 
2.
harm a hair on someone's head
碰（伤）某人一根头发。
If you so much as harm a hair on her head, I won't forgive you.
你伤她一根头发，我也不会原谅你。
He loves me. He would never harm a hair on my head.
他很爱我，绝对不会伤害我，哪怕只是一根头发。
 
3.
let one's hair down
把头发放下来，可以引伸为精神放松。
I had a tough day today at work. It was nice to finally get home so that I could let my hair down and have a drink or two.
今天在单位我整整忙了一 天，终于到家了，可以放松下来，喝杯酒，感觉真好。