average,ordinary,common有什么区别吗?普通人用什么来表达?

average
意为"平均的""中等的,普通的,平常的"
例如:
the average age 平均年龄
an article of average quality 质量一般的货品
ordinary
意为"普通的,平淡无奇的" 指"没有什么特别的地方"
例如:
We are all ordinary people. 我们都是普通人.
Although she was rich, she was always in ordinary dress.尽管她很富有,但她总是穿着平常的衣服.
common
意为"共同的,普遍的"
例如:
He is their common enemy.他是他们的共同的敌人.
This custom is very common in that area.这种风俗在那个地方很普遍.
It has become common knowledge.这已经是众所周知的了.
提示: common也可作"普通的"讲,这时可以同ordinary 换用,"普通人"也可以说成common people