My father is forty-one years old.

My mother prepares a traditional frugal Japanese meal every day.

He told me the whole story of the incident.

He was reading a book in his room all day.

Liquid oxygen is often used as rocket fuel.

We cannot live without oxygen.

There is a custom of eating rice cakes facing the favorable direction at the New Year.

This color has a high degree of saturation.

This sponge is saturated with water.

Let's calculate the normal of this line and plane.