18. 科学是好东西，只要它不跟任何人的饭碗挂钩就行。
Science is a wonderful thing if one does not have to earn one's living at it.
19. 态度上的弱点会变成性格上的弱点。
Weakness of attitude becomes weakness of Character.
20. 天才和愚蠢之间的区别就是天才有它的极限。
The difference between genius and stupidity is that genius has its limits.
