恋爱是艰苦的，不能期待它象美梦一样出来。

Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever and to whatever abysses nature leads, or you shall learn nothing.  

这个世界充满了神奇的事物，耐心地等待我们的感官变得更加敏锐。

Every problem in NP can be reduced to the satisfiability problem, which is the cornerstone of computational complexity theory.