It tells about a poor boy who trades identities with a member of England's ruling family.

VOA: special.2010.03.21

If they're paid by commission on each trade they just keep calling you up and coming up with new ideas for new trades.

如果他们的薪水来自交易中抽取的佣金,他们就会不断拜访你,告诉你一些关于新交易的新点子

耶鲁公开课 - 金融市场课程节选

The president is promoting his initiative to reform and strengthen community colleges, which offer training in various trades and professions.

VOA: standard.2009.07.14