The central vowels in Japanese are 'a', 'e', 'o'.

Front vowels are pronounced using the front part of the tongue.

A front vowel is a vowel that is articulated with the front part of the tongue.

He is doing exercises to strengthen his genioglossus muscle.

The hyoid muscle is an important muscle that connects the larynx and the tongue.

He identifies himself as an atheist.

He is trying to understand the universe from the perspective of panpsychism.

Pragmatics is a part of linguistics that considers not only the meaning of sentences but also their usage situations.

He is a believer in deism, believing that God created the universe and then left it alone.

Topology is a branch of mathematics that abstracts and generalizes the concept of space.