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

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

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

The heliocentric theory is the idea that the sun, not the earth, is the center of the universe.

He believes in the geocentric theory.

He is writing a thesis on abiogenesis.

He is writing a thesis on monotheism.

We should always remember the power of Kannon in difficult times.

This report was submitted dated the eighth.

I buy fresh vegetables at the nearby greengrocer every week.