永远不要让恐惧决定你的未来。
The human spirit is stronger than anything that can happen to it.
一个好的模型是准确性和简洁性之间的折衷。
精通不是天才或天赋的功能。它是时间和强烈专注于某一特定知识领域的功能。
The chemical industry is the backbone of modern civilization, and we must treat it with the responsibility it deserves.
中心地的等级越高,其服务的区域越大,此类中心地的数量越少。