One answer is there are times in your life where half a second can matter a lot.

第一个答案是,在你生命在有很多时候,半秒钟能产生巨大的影响。

耶鲁公开课 - 心理学导论课程节选

It has a half-life of approximately three years at which time it stops decaying.

它生命的一半是三年,在三年的时候，它就停止衰亡。

麻省理工公开课 - 固态化学导论课程节选

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