因此,国家并非自古以来就存在。曾经有一些社会没有国家,对国家或国家权力毫无概念。在一定的经济发展阶段,这必然与社会分裂成阶级有关,国家变成了一种必要性。
实际发展水平与潜在发展水平之间的距离,前者由独立解决问题决定,后者由在成人指导下或与更有能力的同伴合作解决问题决定。
Change starts with awareness, but it requires action to make a real difference.
Success is not about how much money you make, it's about the difference you make in people's lives.
数学的美在于它能够以最简单的术语描述宇宙。
One never notices what has been done; one can only see what remains to be done.
The novel is a kind of mirror that reflects the world.