科学不是可以不劳而获的。诚然，在科学上除了汗流满面是没有其他获知的方法的；热情也罢，幻想也罢，以整个身心去渴望也罢，也不能代替劳动。Science is not something you can get for nothing. It is true that in science there is no other way to know except through perspiration; enthusiasm, fantasy, and desire with the whole body and mind cannot replace labor.——Alexander Herzen
