He says, "Boy, this is complicated theory.

他说，哦，这是一个复杂的理论。

耶鲁公开课 - 文学理论导论课程节选

Now the word theory has a very complicated etymological history that I won't trouble you with.

理论这个词的词源非常复杂,你们不需要了解。

耶鲁公开课 - 文学理论导论课程节选

So, I will point out, in terms of MO theory, because it rigorously does take into account quantum mechanics, it starts to become complicated once we go beyond diatomic molecules.

我要指出的是，对于MO理论，以为它严格的遵守量子力学，所以一旦超过双原子分子,就变得十分复杂了。

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