Productive thinking is characterized by the sudden appearance of the solution as an insight.

通货膨胀无论何时何地都是一种货币现象。

The middle of every successful project looks like a disaster.

预测未来的最好方式就是创造未来。

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.

学习是系统中产生的任何变化，这些变化或多或少会永久性地改变其适应环境的能力。