He is majoring in phonology at university.

The study of phonons is an important field in physics.

He left a will.

He chose a stable job, saying 'a bird in the hand is worth two in the bush.'

On is always maintaining a calm attitude.

He is hiding a secret.

That sound is very beautiful.

I like listening to music.

He is practicing the pronunciation of Japanese.

The benefits of this project will greatly affect the local economy.