But there is a fundamental paradox in the search for such a complete unified theory.

但是在寻找这样一个完整的统一理论的过程中存在一个根本的悖论。

We don't yet have a complete and consistent theory that combines quantum mechanics and gravity.

我们还没有一个完整而一致的理论，将量子力学和引力结合起来。

But as soon as we pass to the problem of what determines output and employment as a whole, we require the complete theory of a monetary economy.

但是，一旦我们谈到什么决定了整个产出和就业的问题，我们就需要完整的货币经济理论。

The primitive concept of five elements later evolved into a complete and complex theory which, together with yin-yang theory, serves as a theoretical tool to understand and analyze all natural phenomena.

五行的原始概念，后来演变成一个完整的和复杂的理论，加上阴阳理论，被用来作为理论工具来了解和分析所有自然界的现象。