This piece of art is made of serpentine.

He is interested in heraldry and is researching his family's coat of arms.

This cold is unbearable.

He is a disciple of a famous painter.

He was wearing a kimono with a mon proudly.

It's no big deal if he's a little late.

My grandmother's forty-ninth day is next week.

He is using an octant for navigation.

He is working round the clock.

We must strive to protect the environment of the Earth.