计算理论不仅仅是关于解决问题，还涉及理解可计算性的极限。
如果你不适应变化，你就会落后。
The future of democracy depends on the ability of democratic societies to reform themselves and adapt to new challenges.
过去从未消亡，它甚至从未过去。
The dead are never far from us. They’re in our hearts and on our minds and in the end all that separates us from them is a single breath, one last puff of air.
Don't give up easily, because you never know what will happen in the next second.
