"Un libro es una conversación entre el autor y el lector a través del tiempo."
数学不仅仅是关于数字、方程、计算或算法:它是关于理解的。
Quality is never an accident; it is always the result of intelligent effort.
In the short run, the market is a voting machine but in the long run, it is a weighing machine.
Every landscape is a state of mind.
If we want to protect forests, we must first understand them.