Mountainous areas are ideal for hiking.

I climbed three mountains.

Mr. Yama is my best friend.

When spring comes, I go to the mountains to look for bamboo shoots.

Chikun is my best friend.

The reason for his behavior is because it lacks reason.

I drink coffee every morning.

The brief encounter with him changed my life.

The study of the genome is an important field in genetics.

He is a person who follows his own path, and the phrase 'a big fish does not swim into a small stream' fits him perfectly.