永远不要把运动和行动混为一谈。
The most valuable hydrocarbon molecule is the one we don't need to burn.
过去从未死去,它甚至还未过去。
To understand the present, we must understand the past.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的:它是关于理解的。