计算机图形学中最重要的就是理解光以及它如何与表面相互作用。
The improvement of the productive powers of labor, and the greater part of the skill, dexterity, and judgement with which it is anywhere directed or applied, seem to have been the effects of division of labor.
"Every story is two stories - the one on the surface and the one hidden beneath."
——《建国方略·孙文学说》（1917—1919年）
保持虚心才能了解实情，保持冷静才能判断行动是否正确
