A dorsal sound is a sound that is pronounced by the back of the tongue approaching or touching the palate or pharynx.

The theory of phonetic shift is an important part of linguistics.

This word is affected by the sound shift.

He is an expert in musicology.

He is an expert in orthoepy, teaching pronunciation.

This room is covered with soundproofing material, so the sound doesn't leak outside.

He honked the car horn to get my attention.

He is exactly in the state of 'A frog in a well does not know the vast ocean.'

He spoke of his big dreams, saying, 'How can a sparrow understand the ambitions of a swan?'

Infrasound is a type of sound that is inaudible to the human ear.