A collection of principles giving a more or less complete and rounded view of an art or science.

学说；理论。

A statement of a supposed principle intended to esp. one that has been verified to some extent.

原理(尤指一部分业已证明者)。

The sphere of speculation as opposed to practice.

空论；臆测。

A speculative view or opinion.

见解；意见。

Abstract principles of a science or art distinguished from its practice or application.

抽象理论(有别于应用原理)。