The return on an investment is how much you made from the investment as a percent of the money invested.

投资的收益是指,你在整个投资中赚的钱占本金的百分比

耶鲁公开课 - 金融市场课程节选

The return he got from 1996 to 2006 was 17% a year on investments.

从1996到2006,他的个人投资收益率为一年17%

耶鲁公开课 - 金融市场课程节选