【辨】commerce，trade和dealing。commerce意为“商业”，一般指国家之间、地区之间的贸易往来，其所指范围广，如：In the US, New York City is the chief seat of commerce. 在美国，纽约是主要的商业中心。trade则指“贸易”，较抽象，如：Trade with other countries is important. 与其他国家进行贸易很重要。dealing指具体的某种“交易”，如：I’ve never had any dealing with him. 我从来没有和他做过生意。
［例］Our country has been trying to broaden its commerce with other nations.
He majored in international commerce in college. 他大学时的专业是国际贸易。
commission n.委员会；委任, 委托；代办权, 代理权；佣金
［例］If you are going to Hong Kong, I have two or three small commissions for you.
Some salesmen in big shops receive a commission of 10％ on everything they sell, as well as a salary. 大商店有些店员不仅有薪金，而且还可抽取所售货物百分之十的佣金。
［例］The novelist makes his heroine commit suicide at the end of the book. 那位小说作者在书的结尾让他的女主人公自杀了。
He would not commit himself in any way.
The girl was committed to the care of her aunt. 这女孩被交给姨母照顾。