统治者的首要职责是保护社会免受其他独立社会的暴力和侵略，只有通过军事力量才能实现这一职责。
The first duty of the sovereign， that of protecting the society from the violence and invasion of other independent societies， can be performed only by means of a military force.
Sometimes you have to be knocked down lower than you have ever been to stand back up taller than you ever were.
理解生命的机制就像解开宇宙最大的谜团。
可持续性不是终点，而是一个需要持续改进和创新的旅程。