"If children were exclusively breastfed for six months, continued to breastfeed up to two years, with appropriate additional food from six months onwards, we could save 1.5 million children under five years of age out the 8.8 million that we estimate to die currently every year."

VOA: special.2010.08.04

A cohort study means you take the same group of people and follow them every five years for that period of time.

定群研究意味着你只有一组研究对象,然后在研究期间每五年进行一次记录数据

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Let's say you want to see how something like cigarette smoking is changing in the population and the rates of cigarette smoking, and you want to look at people every five years from 1970 to 2000.

比如你想知道,人群中吸烟者的人数变化,和吸烟者的比例,在1970年至2000年每五年的情况

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

I will give you all development and all you have to do is every once in five years make sure you come and vote for me, and this thing will go on,"

VOA: standard.2010.02.24

If this was tetanus, you got this tetanus vaccine when you were young; you get a boost every five or ten years because your antibody levels are starting to fall.

以破伤风为例,小时候,你接种过破伤风的疫苗,每隔五年或十年要再接种一次,这是因为体内的抗体浓度会下降

耶鲁公开课 - 生物医学工程探索课程节选

What that means is that you would borrow $5,000 to buy a house and in five years and every year along the way you'd be paying interest on your mortgage.

它的意思是,你借了5000美元去买一所房子,期限是五年,在这五年内,每年你要归还抵押贷款的利息

耶鲁公开课 - 金融市场课程节选