Behavior is determined by the current stimulus situation and past reinforcement history.

我们知道世界将不再相同。少数人笑了，少数人哭了，大多数人沉默不语。

编程的艺术是组织复杂性的艺术。

The writer's only responsibility is to his art.

土地不属于我们，我们只是从后代那里借来的。