量子密码学不依赖于数学问题的难度，而是依赖于物理学的基本定律。

International politics is a brutal and unforgiving arena, where states constantly strive to maximize their power and security.

History is that certainty produced at the point where the imperfections of memory meet the inadequacies of documentation.

科学并不试图解释，甚至几乎不试图诠释，它主要是构建模型。