common/ˈkɔmən/
adj.1. 共同的；共通的；联合的；公共的a common cup公用杯子
2. 常见的；常有的Snow is common in cold countries.在寒冷的国家雪是常见的。
3. 普通的；熟悉的the common man普通人
The humorous joke is common property.这个幽默笑话大家都知道。
4. 低俗的；质劣的；粗鄙的I don't like him, for he's as common as muck.; He's as common as dirt.他这人粗俗不堪，我不喜欢他。