Rutherford Hayes kept his promise to serve only four years.

VOA: special.2010.03.11

And not only was it a party school, you were going to have an amazing time for the four years and beyond.

不仅是个派对大学，而且未来四年甚至以后，都会过得很快乐。

哈佛公开课 - 幸福课课程节选

"If I could get done what I think needs to get done in four years, even if it meant that I was only president for four years, I would rather be a good president taking on the tough issues for four years, than a mediocre president for eight years,".

VOA: standard.2009.03.19