生活在美国宪法下是人类历史上赋予的最伟大的政治特权。
The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
"La literatura es el arte de la paciencia, la disciplina y la entrega absoluta."
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.