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。
- My brother's in business.
- He's in the frozen food business.
- Our firm does a lot of business with overseas customers.
- Eventually they found a consultant they felt they could do business with (= with whom they could work well).
- Currently, there are fewer firms in business (= operating) in the area than ever before.
- This new tax will put a lot of small firms out of business (= they will stop operating).
- She set up in business (= started her own company) as a management consultant.
commerce : 多指大规模的买卖或易货关系。
- the world of commerce and industry
- leaders of industry and commerce
- They have made their fortunes from industry and commerce.
- The business is no longer regarded as a citadel of commerce.
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。
- The country's trade in manufactured goods has expanded in the last ten years.
- 70 percent of the country's trade is with Europe.
- The two countries have signed a trade agreement for one year only.
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。
- The treaty was based on a bargain between the French and German governments.
- "I'll clean the kitchen if you clean the car." "OK, it's a bargain."
- The management and employees eventually struck/made a bargain (= reached an agreement).
deal : 口语用词，指买卖双方经过交涉达成协议成交。
- a business deal
- The unions and management have made a two-year pay and productivity deal.
- I'll make/do a deal with you - you wash the car and I'll let you use it tonight.
- She got a good deal (= paid a low price) on her new house.
- Is industry getting a raw/rough deal from (= being unfairly/badly treated by) the EU?