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

这是历史概括问题，而不是纯问题。

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

心学从纯向更仔和系统观察。

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

但是我们所有谈话都仅限于纯，没有别。

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

这些纯概念引领了原子和未实现生物学领域。

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纯。