merchant,besinessman,trader有什么区别

merchant
就是说：这个人或公司是进行批发交易的。尤其是知那种外贸生意，或者什么特殊的交易。
a person or company involved in wholesale trade, esp. one dealing with foreign countries or supplying merchandise to a particular trade : the area's leading timber merchant | a tea merchant.
• a retail trader; a store owner : the credit cards are accepted by 10 million merchants worldwide.
• (esp. in historical contexts) a person involved in trade or commerce : prosperous merchants and clothiers had established a middle class.

trader
就是说：这个人是买卖货物的，或者货币啊，股票啊。经营规模比较狭小的说。
a person who buys and sells goods, currency, or stocks.

businessman
就是说：一个在商业圈打拼的人，尤其是管理阶层。就是有身分有地位了。可以翻译为：商人。
a man who works in business or commerce, esp. at an executive level.
• [with adj. ] a person with a specified level of skill in financial matters : his knowledge and talent were never in question, but he was a poor businessman.