The photograph is a very poor way of communicating what something actually looks like.
数学中的每个问题都是一个等待解决的谜题,而乐趣就在于解决的过程。
行为主义者放在自己面前的规则或衡量标准总是:我能否用"刺激和反应"来描述我所看到的这一行为?
The soul's joy lies in doing.