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

So,the combination of survivorship bias and backfill bias for that one year made 4.3 percentage points difference.

因此在生存偏差和回填偏差的共同作用下,造成了两个收益率之间4.3%的差值

耶鲁公开课 - 金融市场课程节选