He was calculating in his head.

Please sit in this seat.

Please wait until your turn.

What is the volume of this dam?

This cylindrical chart helps to visually understand the basic concepts of physics.

The teacher gave me a book.

The teacher gave me some advice.

We are considering introducing a new voting system.

We have developed a new methodology to solve this problem.

Thanks to 'Oshiete-kun', I have become good at Japanese.