The lightning that precedes the thunder is a common image of the warnings that come before calamity.
The best way to predict the future is to create it.
在数学中,最简单的问题往往导致最深刻的发现。
从灵魂的角度研究心灵的现象无异于通向完美知识的道路。
Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.