This hardened dirt is so hard, nothing can be planted.

A central vowel refers to a vowel where the position of the tongue is in the middle.

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

He is writing a thesis on the octovocalic theory.

It is said that this area used to be a mass grave.

I achieved a big success.

He graduated from the University of Tokyo.

His dream is greatly expanding.

Under the big tree, he was reading a book.

This old type of camera has a special charm that newer ones do not.