This is a question for historical generalisation rather than for pure theory.

这是历史概括的问题，而不是纯论的问题。

Psychology shifted away from pure theory and towards more careful and systematic empirical observation.

心纯论转向更仔和系统的经验观。

But all our talk was limited to pure theory and nothing else.

但是我们所有的谈话都仅限于纯论，没有别的。

These purely theoretical concepts led the way to  atomic theory and the unfulfilled biology field.

这些纯论概念引领了原子论和未实现的生物领域。

But the pure theory of what determines the actual employment of the available resources has seldom been examined in great detail.

但是，很少详研究决定可用资源实际使用的纯论。