He is majoring in psychology.

Gaku is my best friend.

He has a deep interest in archaeology.

Natural language understanding is an important field of artificial intelligence.

He is spending a lot of time on experimental research.

An earthquake early warning was broadcasted on TV.

He is undergoing training for extravehicular activity.

He engaged in an extravehicular activity from the spaceship.

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

He is majoring in linguistics.