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 has full mastery of the art of cooking.

The police have started an investigation to identify the unidentified decedent.

He seems to be enjoying his trip.

His order was as urgent as a law, and I had to start acting immediately.

I am enjoying a slow walk in the park.

Mr. Ro is eating okonomiyaki.