计算安全不仅仅是建立防护墙，而是要理解威胁的全貌。

The value of a commodity, or the quantity of any other commodity for which it will exchange, depends on the relative quantity of labor which is necessary for its production, and not on the greater or less compensation which is paid for that labor.

画家必须完全准确地描述他们观察主题的体验。

The only way to learn mathematics is to do mathematics.

孤独不是他人的缺席，而是自我的缺失。