这本书探讨了政治理论领域的新思想。

The book explores new ideas in the ___realm of political theory.

恐怕量子物理学超出了我的专业领域。

I'm afraid quantum physics is beyond my ___realm of expertise.

人工智能领域最近的突破令人惊叹。

Recent breakthroughs in the ___realm of artificial intelligence are astonishing.