■ 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？

• counsel
• counsel 与 council
• counterpart
• country
• country
• country
• country, nation, state
• couple
• courtesy
• cow
• cow, ox, bull 与 buffalo
• crawl
• crazed
• crazed 与 crazy
• crazy
• credentials
• credible
• credible 与 creditable
• credit
• creditable
• crime
• crime
• crime 与 sin
• critical
• criticism