He was looking out from the upper-story window.

He opened the door and entered the room.

Tantalum is a metal that is resistant to high temperatures.

The density of this substance is defined by its mass per unit volume.

This red sand is very beautiful in color.

He carefully drew the picture.

He worked on the project with assiduity.

I am planning to go to Botan next week.

The history of Handan is very old.

That lone plane is flying in the sky.