Spectroscopy is an important means of investigating the properties of matter.

Reverse Polish notation is one method of expressing calculations.

Electromagnetic radiation conveys energy in forms such as light and radio waves.

My four treasures of the study are a fountain pen, a pencil, an eraser, and a ruler.

He is an expert in international law.

He is an expert in dialectology, studying dialects from all over Japan.

Jus gentium is a universal law that applies to all people.

This law is based on the ancient Banminhō.

In our house, we watch foreign news using satellite broadcasting.

He thought deeply about the result of that juristic act.