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 value of unpaid work is often invisible in economic measures, yet it is the backbone of society.
Efficiency in mining isn't just about speed; it's about doing more with less waste.
知识在心灵中以符号结构的形式表征。
我们要做海洋的守护者,而不是掠夺者。