The Lehman Brothers bankruptcy on September fifteenth was a shock to the system, but not the only one.

VOA: special.2009.09.18

They can push down the thirteenth partial and bring up the fifteenth and thereby change the sound of a clarinet into a French horn.

压低第十三分音,或者提高第十五分音,从而将单簧管的声音变成圆号的

耶鲁公开课 - 聆听音乐课程节选

So, why should a non-frightening incongruity cause people to make a distinctive loud noise consisted of staccato segments of one fifteenth of a second each separated by a fifth of a second?

为什么不引起恐惧的不一致性,会让人们发出一种与别不同的声音,而且这种声音是间断的，一节声音持续15分之一秒,两节声音之间也是相隔15分之一秒？

耶鲁公开课 - 心理学导论课程节选

In the fifteenth century, a greenhorn was a young cow or ox whose horns had not yet developed.

VOA: special.2010.05.23

Then, on the night of February fifteenth, a powerful explosion shook the battleship Maine in Havana harbor.

VOA: special.2010.07.08

He was still working in Big Piney,Wyoming, when he died of a heart attack on January fifteenth.

VOA: special.2009.02.23

On April fifteenth he gave a speech in which he discussed his goals for space travel.

VOA: special.2010.04.28