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。
I'm the reason your hands won't work.
每个故事都是谎言，直到有人相信它。
君子的话虽然少，但却真实；小人的话虽然多，但却虚假。点评：东汉著名学者王符曾言「大人不华，君子务实。」
无论有无宗教，好人都能行善，坏人都会作恶；但要让好人作恶——这需要宗教。
To signal an emergency， use the rule of three； 3 shouts， 3 horn blasts， or 3 whistles.
The intersection of cryptography and complexity theory is where some of the most fascinating problems in computer science reside.
The pace of change will never be slower than it is today.
The city is a great artifact, the supreme work of human civilization.