The exam period is very busy.

He was behaving as if he was crazy.

He is doing a special exercise to strengthen his sternohyoid muscle.

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.

When will this pain end?

Infrared astronomy plays a very important role in the study of the universe.

Infrared astronomy provides a new perspective on understanding the universe.

Understanding the concept of 'Ha-line conversion sounds' is important in learning Japanese.

He found forensic evidence.

He is a world-renowned ichthyologist.