A central vowel is a vowel that is pronounced in the central part of the tongue.

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

He often behaves strangely because of his 'chuunibyou' (middle-school 2nd year syndrome).

He is showing behavior characterized by 'chuunibyou'.

He was born and raised in China proper.

He started exercises to strengthen his gluteus medius muscle.

The whimbrel is a bird often seen on the coast.

The whimbrel is a bird often seen on the coast.

He continued to write that report all night.

I live in the Chūgoku region.