A labial sound is a sound that is pronounced using the lips.

His English pronunciation is very natural.

He is practicing the pronunciation of Japanese.

In Sanskrit phonology, bilabial sounds play an important role.

Her lips are red and attractive.

His speech sound is very attractive.

I am majoring in auditory phonetics at university.

Articulatory phonetics is a study about the production of speech sounds.

Acoustic phonetics is the study of the physical properties of speech.

He opened his mouth in surprise.