Sustainability isn’t an option; it’s the only way forward.
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。
The essence of strategy is in the activities – choosing to perform activities differently or to perform different activities than rivals.
The greatest happiness is to know the source of unhappiness.