So, initially they came up with four lines and then eventually five and even six, and then they went back to five by the fifteenth century.

那么,他们最初提出的是四条线,但是最终却是五条线,甚至六条线,然后在十五世纪又回到了五条线

耶鲁公开课 - 聆听音乐课程节选

I did a performance there for Prince Philip's 75th birthday, which was 15 years ago, actually.

我为菲利普亲王的七十五岁生日表演过，这是十五年前的事了。

记忆犹新的作品 - SpeakingMax英语口语达人

not to mention ten and fifteen.

别提十年或者十五年聚会了。

普林斯顿公开课 - 人性课程节选

There were some twelve to fifteen different widths of railroads in the Northern states alone by the 1850s, and you could go into one town on a gauge, i don't know, three feet wide but on the other side of town it would come out four feet wide.

在五十年代,单就北方州的铁道,就有十二到十五种不同的轨距,你可能在一条三英尺宽的铁道上进镇,但在另一边出镇时,它变成四英尺宽了

耶鲁公开课 - 美国内战与重建课程节选

You had mentioned that the losing side casualty numbers were approximately about 15%?

您前面提到了伤亡者,大约是百分之十五

耶鲁公开课 - 古希腊历史简介课程节选

But that was, I don't know, 15 years ago, and that was fun.

但是那是，我不记得了，十五年前了，那很有趣。

在公园相遇的老师 - SpeakingMax英语口语达人