无政府状态是战争的允许性原因；它创造了一个国家必须依靠自助来确保生存的环境。
Anarchy is the permissive cause of war; it creates an environment in which states have to rely on self-help to ensure their survival.
数学的目标是理解我们观察到的现象背后的结构。
The only way to write well is to write badly first.