Translation of "Theories" in Chinese

I don't want to hear your theories.

我不想听你的理论。

My friend believes conspiracy theories; should I try to prove him wrong?

我的朋友相信阴谋论，我该试着向他指出他错了吗？

The explanation below was achieved by comparing and contrasting a variety of different theories.

下面的解釋是通過比較和對比各種不同的理論。

The book is full of far-flung theories without any basis in scientific fact.

書中滿是遙不可及、沒有科學根據的理論。