business 指包括售货、购货、换货在内的综合商业活动，方式可以是批发或零售。
commerce 多指大规模的买卖或易货关系。
trade 普通用词，含义广。既可指某种具体的商业又可指广泛的贸易。
bargain 多指买卖双方通过谈判、协商就商品质量、数量、价格等项达成协议所成的生意。
deal 口语用词，指买卖双方经过交涉达成协议成交。
参考例句
1. Science deals with facts. 科学是论述客观事实的。
2. A deal with us means a good deal to you. 和我们做买卖意味着您做了一笔好买卖。
3. We should 我们应该学会处理这些问题。
英英解释
n.
1. a particular instance of buying or selling
2. an agreement between parties (usually arrived at after discussion) fixing obligations of each
3. (often followed by `of') a large number or amount or extent
4. a plank of softwood (fir or pine board)
5. wood that is easy to saw (from conifers such as pine or fir)
6. the cards held in a card game by a given player at any given time
7. the type of treatment received (especially as the result of an agreement)
8. the act of distributing playing cards
9. the act of apportioning or distributing something v.
1. deal with verbally or in some form of artistic expression
2. take action with respect to (someone or something)
3. take into consideration for exemplifying purposes
4. come to terms or deal successfully with
5. administer or bestow, as in small portions
6. do business; offer for sale as for one's livelihood
7. be in charge of, act on, or dispose of
8. behave in a certain way towards others
9. distribute to the players in a game
10. direct the course of; manage or control
11. give out as one's portion or share
12. give (a specific card) to a player
13. sell
