黄芩（唾手可得）没有造假，阿魏（稀有昂贵）容易造假。

Freedom does not consist in any dreamt-of independence from natural laws, but in the knowledge of these laws, and in the possibility this gives of systematically making them work towards definite ends.

Mathematics is the language with which God has written the universe.

二手车市场是信息不对称的经典例子。

数学是理性的音乐。