很多人真的对自己太自信了。你对明天大A是涨是跌如何都没法“明明知道”，怎么就那么大把握知道几年几十年以后某专业的发展如何呢？最近毕业的CS码农知道自己当时报了一个“天坑”专业吗？The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts.