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.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

His efforts were like a mantis trying to stop a chariot, he couldn't achieve any results.

When I caught a cold, I tried heat therapy.

He is immersed in the study of dialectical materialism.

He is deeply involved in the animal liberation movement.

My father works at a law firm in Tokyo.