This audio is very clear.

He is good at pronouncing lateral sounds.

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.

He is conducting research on the radula of mollusks.

My tooth hurts.

He stuck out his tongue and licked the ice cream.

He is brushing his upper teeth.

He is practicing the pronunciation of Japanese.

A lingual sound is a sound that uses the tongue when pronouncing.

There is a beautiful mural painted on the side of this building.