四元数的诞生,如同几何、代数、形而上学和诗歌这四位父母的奇特后代。
安全不仅仅是一项政策,它是一种生活方式。
In a world filled with hate, we must still dare to hope. In a world filled with anger, we must still dare to comfort. In a world filled with despair, we must still dare to dream. And in a world filled with distrust, we must still dare to believe.