我们从这样的假设开始：任何学科都可以以某种智力上诚实的形式有效地教给处于任何发展阶段的任何孩子。
We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.
We are all just walking each other home.
The greatest disability is a bad attitude.
能源安全是国家战略安全的重要基石，我们必须把能源饭碗牢牢端在自己手里。
写作就像在大理石上雕刻：每个词都必须精确且不可复制。