Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.
我们的主很狡猾,好在他不怀歹意。
The only valid data for psychology are the reports of trained observers.
An athelete may run ten thousand miles in order to prepare for one hundred yards. Quantity gives experience.
未来不是沉重的,而是轻盈的。
The work of art is the result of a struggle between the artist and his material.