相关性和因果关系之间的区别在实证工作中是根本性的。

给定系统中的酸和碱不是绝对的，而是相互关联的。

The only purpose for which power can be rightfully exercised over any member of a civilized community， against his will， is to prevent harm to others.

创新不仅仅是技术的问题；它关乎改变人们的思维和行为方式。