代数分析很快让我们忘记了研究的主要对象,将注意力集中在抽象的组合上,直到最后我们才回到最初的目标。
Human kindness has never weakened the stamina or softened the fiber of a free people. A nation does not have to be cruel to be tough.
"What is a hero without love for mankind?"
The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.