记得很久之前,看过一个哈佛公开课的视频,其中有一个让人挣扎的“假如”:假如你是一个火车司机,正驾驶一辆飞快的机车行驶在规定的路上。突然,你发现,在前面的路上,有几个养路工人正在对铁轨进行养护,完全没有感觉到危险——这时急煞根本无效,结果是必然的。然而,柳暗花明,另一个可能出现了:铁轨还有另一条岔路,你可以走向另外一个方向避开这些工人;可那里,也有一个养路工在工作,你走向另一条道路,他将必然成为受害者。 I remember watching a video of Harvard Open Class a long time ago, including a struggling “If”: If you are a train driver, driving a fast locomotive on the road. Suddenly, you found that on the way ahead, several road maintenance workers were curing the tracks without any danger at all - at this moment they were totally ineffective and the result was inevitable. However, it is clear that another one may emerge: There is another fork in the rails, and you can go the other way to get around the workers; there, there is also a road builder who works, and you go to the other road and he will inevitably become a victim .