technical; specialist; professional
Describes something requiring specialized knowledge or skill, or something intended for experts rather than the general public. Can also imply a narrow or exclusive focus.
This paper is too technical for the general public to understand easily.
彼は専門的な知識を活かして問題を解決した。
He solved the problem using his specialist knowledge.
This issue is too technical for me to understand.
He studied law specifically at university.
The doctor explained the treatment from a specialist's point of view.
To become a pilot, you need to receive specialized training.