A centralized political system is one in which all power is concentrated in the central government.

Vowel harmony plays an important role in the phonology of certain languages.

There are five monophthongs in Japanese.

There are five short vowels in Japanese.

You need to be careful with the pronunciation of long vowels in Japanese.

A nasal vowel refers to a vowel that is pronounced through the nasal cavity.

The nucleus is the central part of a syllable in phonetics.

My grandmother's forty-ninth day is next week.

He is working hard on his Japanese studies day by day.