common/ 'kɔmən /

1.adjective
(usual) 常见的

Jones is a common name there.
琼斯在那儿是个常见的名字。
2.adjective
(shared) 共同的

Our countries share a common frontier.
我们的国家有共同的边界线。
3.adjective
(not special) 普通的

the common man
普通人
4.adjective [+person] [ manners] 
(vulgar) 粗俗的

She's a little common at times.
她有时有点俗气。
5.noun [c] 
(area) 公用地

common to
常见于
in common use
常用
it's common knowledge that...
大家都知道…
for the common good
为了大家的利益
the idea has become common currency
这观点已是众所周知的了
common ground
共同点
to have sth in common
 [+people] 有某些共同点
6.noun [things+] 
有共同的某特征

to have sth in common with sb/sth
与某人/某物有某共同点
not to have anything in common (with sb/sth)
(与某人/某物)没有任何共同点