■ 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？

• in truth
• in turn
• invaluable
• invasion
• invent
• involve
• involved
• involve 与 entail
• irregardless
• island
• isle
• isles
• issue
• it
• it is...for...to...
• it is... for... to... 与 it is... of... to...
• it is...of...to...
• it is xs that who …
• itself
• iv
• jealous
• jealousy
• jealous 与 jealousy
• jewellery
• jewelry