You have 500 miles of canals dug just in the middle decades of the seventeenth century.

仅在十七世纪中叶,这里就开凿了,五百英里的人工运河

耶鲁公开课 - 欧洲文明课程节选

And that causes five to ten million deaths per year.

每年这会导致五百到一千万的人死亡

耶鲁公开课 - 生物医学工程探索课程节选

Five hundred years ago, that wouldn't have sounded dark.

五百年前,这个听起来绝对不阴暗

耶鲁公开课 - 聆听音乐课程节选