None of us have seen a case of smallpox, it hasn't existed in the world for many decades now.

我们没人见过天花,在这个世界上它已经被消灭几十年了

耶鲁公开课 - 生物医学工程探索课程节选

But, you know, I know someone who was a teacher in a Chicago public school for decades and lost his job, teaching math to high school kids, because he is gay.

我认识一个任职于,一所芝加哥公立学校几十年的老教师,被解雇了，他在高中教数学，仅仅是因为他是同性恋。

普林斯顿公开课 - 人性课程节选

The options have been traded for several decades, starting with the Chicago Board Options Exchange.

期权最初从芝加哥期权交易所进行交易,到现在已经交易了几十年

耶鲁公开课 - 金融市场课程节选

After decades of relatively unspectacular growth, compared to the east Asian economies, India's economy suddenly took off three or four years ago, growing at 8% or more a year.

经历了几十年的相对高速发展后，与其他东亚经济体相比，印度经济三或四年前突然开始腾飞,以每年8%甚至超过%,8%的速度增长。

普林斯顿公开课 - 国际座谈会课程节选

The world has changed since then, and in the last decade or so, India and the United States have become closer, economically as well as politically, so I think it's definitely a warmer relationship.

而后来世界格局发生了改变，在最近几十年，印美关系亲近许多，不论是经济上还是政治上来说，因此我认为印美关系良好。

普林斯顿公开课 - 国际座谈会课程节选