This region is strongly influenced by sinicization.

He was reading a book in his room all day.

The moment I saw the exam questions, my mind went blank.

We are right in the middle of studying for the exam.

He had to have surgery because his nasal septum was deviated.

An infix is a morpheme that is inserted inside a word.

He is majoring in Sinology.

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).