We use the solar calendar.

We calculate time using the solar calendar.

The use of this machine is simple.

This computer can be used by anyone.

The ocean covers most of the surface of the earth.

The durability of this washing machine is 10 years.

He explained the gist of the story.

A solar day is the time it takes for the Earth to orbit around the Sun.

I couldn't understand the state of his behavior.

That great demon had the power to destroy the village.