The researchers studied the diets of thirty-one thousand children ages two to eighteen over a thirty-year period.

VOA: special.2010.03.17

If it was a twenty-year bond, there would be forty coupons, one for each six-month period, and each one would have a date on it.

假如是20年债券,会有40张息票,每六个月一张,并且上面会有日期

耶鲁公开课 - 金融市场课程节选

Over that eighty-one year period you would have gotten a multiple of seventy-two.

经过81年时间,你翻了72倍

耶鲁公开课 - 金融市场课程节选

And what happened is, over a 30-year or so period, the industry really shifted to be one where industry standards started to come into play, the customers started to have a bigger role.

经过了30年左右，这个行业发生了变化,出现了产业标准，消费者的角色也越来越重要。

斯坦福公开课 - 戴尔CEO-Michael.Dell谈创业和发展课程节选