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 greatest discovery of my generation is that a human being can alter his life by altering his attitudes.

技术可以改变世界，但价值观才能决定改变的方向。

I think that life is far too short to be living someone else's dream.

成功来自于努力和坚持。