He is an expert in international relations.

I am good at calculations.

This book enlightened my thinking.

He roughly carved the wood into shape.

Kei's birthday party was filled with everyone's jubilation.

He and I compete in tennis every week.

The tachometer of my car has broken.

He was appointed as the chief executive officer of the company.

He is an expert in computational linguistics and is involved in the development of artificial intelligence.

Computational linguistics is the study of analyzing human language with computers.