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
usual
a.
1. 通常的,平常的;惯常的
He came home later than usual.
他回家比平时迟.
Shall we meet at the usual time and place?
我们在老地方老时间见面好吗?
general
a.
1. 一般的,普遍的;非专业性的
This is a general magazine.
这是一本普通杂志.
2. 全体的;公众的
That is a matter of general anxiety.
那是一个大家忧虑的问题.
3. 大体的,笼统的
We had a general talk about drama.
我们泛泛谈论戏剧.
4. (职位)首席的,总的;...长的
He has been promoted to general manager.
他已被提升为总经理.
5. 将军级的
n.
1. 将军;上将[C]
Washington was a famous general.
华盛顿是一位著名将领.
2. 一般[U]
normal(应该是normal吧）
a.
1. 正常的,正规的,标准的
The doctor said the child's temperature was normal.
医生说孩子体温正常.
2. (人的精神,身体)正常发育的
He did not seem normal to her.
她觉得他精神似乎不正常.
3. 【数】垂直的;直角的
4. 【化】规度的;当量的;中和性的
n.
1. 标准;常态[S]
Relations between the two countries have been restored to normal.
两国关系已恢复正常.
2. 【数】法线[C]
3. 正常人,正常事物