He was calculating in his head.

He solved complex mathematical problems using his new calculator.

His calculating nature sometimes causes problems.

Silicic acid is a major component of glass and ceramics.

By any chance, do you know about me?

This shape is called a great icosihemidodecahedron.

Watching a movie alone is enjoyable.

He deeply believes in the principles of national socialism.

Please grind the coffee beans with a grinder.

I saw a jackdaw in the park.