What I plot on this graph here is as a function time, years, dates, life expectancy as a function of time.

在这儿的这张图是,一个关于时间,年,日期的函数,将寿命长短作为时间的函数

耶鲁公开课 - 生物医学工程探索课程节选

The next slide shows the farm, same farm and its surroundings in 1998, so you can see that a lot has happened here.

接下来这张幻灯片展示的,是1998年的这个农场的周边,你可以看到发生了很大的变化

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

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