My personal thought is that everyone should be treated equally.

He values his private life.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

Orthoclase is a type of mineral, mainly found in granite.

There are more than a billion quintillion stars in this galaxy.

A regular polyhedron is a polyhedron where all faces are the same shape.

The cathode of this battery is made of copper.