Gender roles are an important element in defining individual behavior in society.

Mineral oil is often used in the manufacture of cosmetics and pharmaceuticals.

It is important to understand the importance of health.

He has a deep interest in archaeology.

He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

By regularly checking the key performance indicators, you can understand the performance of the company and devise improvement measures.

He is an expert in ornithology, studying types of birds all over the world.

He is an expert in speleology and is exploring caves around the world.