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.
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。
The mind is an information processing system that operates on symbolic representations.
I'm not a perfectionist, but I like to feel that things are done well.
沟通中最重要的是听到没有说出来的话。
煤炭的未来不在于过去，而在于创新和可持续性。
这个行业的成功不仅以产量衡量，还要看社区的加强和环境的保护。