A half-century ago,for example, producing genetic copies of animals was only a dream of scientists.

VOA: special.2010.03.23

The role of Paris in French life is unique and that has been accentuated over the centuries, particularly the last century and a half, by some of the things that I want to talk about.

巴黎在法国人的生活中的地位是独特的,过去几百年中,这种状况引人瞩目,尤其在近一百五十年里,我想讲的正是关于这方面的内容

耶鲁公开课 - 1871年后的法国课程节选

This refers--this actually goes back to B.F. Skinner, a psychologist who flourished in the first half of this century.

这要追溯到B.F.斯金纳,一位活跃在上世纪前期的心理学家

耶鲁公开课 - 金融市场课程节选

A half century before that, Ben Franklin helped to build a hall in Philadelphia and said the top of this hall would be open to a Muslim preacher from Constant and Obal This is the early 18th century in America.

再有半个世纪前，本·富兰克林帮助在费城建立了一座会堂,他说会堂的顶层将向,一位来自Constant和Obal的穆斯林布道者开放,这些都发生在18世纪的美国。

普林斯顿公开课 - 人性课程节选