I also served for the two years before that as the policy director of President Bush's presidential campain, working at the Texas.

在那之前，我做过两年的,布什总统选举的,政策主任，在德州工作。

普林斯顿公开课 - 国际座谈会课程节选

I got from a person that I worked with for two and a half years before coming here.

我在来这儿之前和他一起工作了两年半的时间。

写推荐书的人 - SpeakingMax英语口语达人

Now, this game, this game of imperfect competition between two firms competing in quantities, was thought up and studied by a French economist called Cournot almost a hundred years before Nash.

这个博弈,这个关于两家公司的产量竞争的博弈,早在纳什出生一百多年前就被,一个法国的经济学家古诺研究过

耶鲁公开课 - 博弈论课程节选

Then from 1820 to 1860, the forty years before the war, an estimated roughly two million American slaves were sold to satisfy the need of slave labor in the great cotton kingdom of the growing Southwest.

之后从1820年到1860年,这战争前的四十年间,据粗略统计有大约两百万美国奴隶被出售,以满足西南部,这个日益增长的棉业帝国对奴隶劳工的需求

耶鲁公开课 - 美国内战与重建课程节选

Very high correlation between the two which in many ways gives credence to the many years of research that has been conducted, before we have the technology to do it in a more sophisticated way.

两者有很大关联，这在很多方面,给多年来进行过的研究提供了可信度，在拥有技术进行更全面的研究之前。

哈佛公开课 - 幸福课课程节选