量子通信的安全性来自物理定律，而不是计算复杂性。
The greatest threat to our forests is not the axe, but indifference.
Handy measure: the distance between your fingertips of your outstretched arms at shoulder level is your height.
解释：国家每做一件事必然是有毁谤也有赞美，忠臣把毁谤都加在自己身上，而把赞美都归于君主。