Retroflex sounds are difficult to pronounce.

Retroflex is a phonetic feature that does not exist in Japanese.

Pronouncing the palatal sounds in Japanese is difficult.

The glottal stop plays an important role in linguistics.

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.