This radio is turned on.

Please turn on the TV.

He forgot to mute his mobile phone during the meeting.

Let's mute the music and study quietly.

Mr. Onda is my best friend.

The doctor listened to his chest with a stethoscope and heard rales.

A sibilant is a sound that is pronounced with the tip or side of the tongue in contact with or close to the upper teeth.

My greatly respected teacher had a big influence on me becoming who I am today.

He is treasuring and preserving old photos.

A phonon is a physical concept that represents the vibration of a crystal lattice.