But the question is how are those of us of this generation, living that ethic out in the early 21st century?

但问题是,我们这代人如何，将在21世纪初的生活中体现这一道德？

普林斯顿公开课 - 人性课程节选

What is it about the Greeks between the years that I mentioned to you that deserves the attention of people in the twenty-first century?

是什么使得久远的古希腊,会值得21世纪的人们,去关注和研究呢

耶鲁公开课 - 古希腊历史简介课程节选

Wooly Willy It turns out these are really hard to find in the 21st century.

，Wooly，Willy？,在21世纪很难发现这些东西了。

哈佛公开课 - 计算机科学课程节选