数学是概念之间关系的科学，与内容无关。
The secret of all effective advertising is not the creation of new and tricky words and pictures, but one of putting familiar words and pictures into new relationships.
"The past is always with us, and it shapes who we are and how we see the world."
Modern quarrying must marry the wisdom of geology with the innovation of engineering.
最好的书是让你重新看世界的书。