He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

Natural language understanding is an important field of artificial intelligence.

He is spending a lot of time on experimental research.

He engaged in an extravehicular activity from the spaceship.

He is undergoing training for extravehicular activity.

An earthquake early warning was broadcasted on TV.

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

He is interested in phrenology.