In our first Yeats lecture, I was talking about Yeats's early development and stylistic transformation over the course of, roughly,a twenty-, twenty-five year period.

在我们讲叶芝的第一节课，我谈到叶芝的早期发展,以及他创作风格的转变，在大约20到25年的时间里。

耶鲁公开课 - 现代诗歌课程节选

The typical -I'm going to talk about the conventional thirty-year mortgage, which has been a standard in the United States ever since the early 1950s.

典型的抵押贷款,我先介绍普通30年期抵押贷款,从20世纪50年代初起,它就是美国抵押贷款的标准期限

耶鲁公开课 - 金融市场课程节选

And you'll find too because of J term this year or winter break where you guys can finally come back onto campus a bit early for various opportunities.

你还会发现由于今年的J学期或寒假,大家可以早点返回校园,这会带来各种机会。

哈佛公开课 - 计算机科学课程节选