You can make multiple--you can put three or four-- the copy gets worse and worse each time, but you've got multiple copies.

你也可以复写多份，放上三四张复写纸-,不过越往下复印的效果会越差，但终归你还是有了多份副本。

耶鲁公开课 - 金融市场课程节选

He spent at least two-thirds of his more than, about three-quarters of his time in the northern states.

他至少花费了他旅程的三分之二,可能不止,应该是他旅程的四分之三时间,周游于北方各州

耶鲁公开课 - 美国内战与重建课程节选

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

Meanwhile, his youth was going away and now this imaginary student is now thirty-three years old never had time to marry or start a normal life.

与此同时，他的青春年华也已经逝去了,现在这位设想出来的同学已经33岁了,还没有结婚也没有开始正常人的生活。

耶鲁公开课 - 金融市场课程节选

It had two--depending on when you look to three dozen major full-time slave traders.

有二十或三十多个,专业的奴隶贩子

耶鲁公开课 - 美国内战与重建课程节选