They are serious and they are many. They will not be met easily or in a short span of time.

VOA: standard.2010.01.15

God saw that he had to limit the life span of humans, or risk creating an enemy that was nearly equal to him.

上帝发现他限制了人类的寿命，否则就是冒险创造了与他平等的死敌。

耶鲁公开课 - 旧约导论课程节选

I've made a lot of really good friends in a really short time span.

在很短的一段时间里，我就交了很多好朋友。

斯坦福的奖学金 - SpeakingMax英语口语达人

Here in the U.S., the rate of obesity doubled over a span of 16 years.

VOA: standard.2010.08.10

Instead, he's known for the development of an encompassing theory of mind, one that he developed over the span of many decades.

相反，他却因为提出了极具包容性的,心理理论而闻名天下，这个理论是他通过数十年的研究才提出的。

耶鲁公开课 - 心理学导论课程节选

But since the St.John's curriculum aims to span almost all of Western culture, students study every branch of the liberal arts - including music.

VOA: standard.2010.05.12

So one of the reasons there is a huge increase in life span is because people aren't dying of things that they would have in prior years.

寿命范围显著增长的一个原因是,人们不再死于,以前那些致死的东西

耶鲁公开课 - 生物医学工程探索课程节选

But if you think of the time span about 900 to 700 B.C., that is, when these changes are taking place.

但是如果你发现它发生在,大约公元前900年到700年之间时

耶鲁公开课 - 古希腊历史简介课程节选