I am studying Japanese.

We are going on a trip together.

He is interested in ancient mathematics.

How much is the calculation for this product?

Sangaku, a form of popular entertainment in the Nara era, was greatly enjoyed by people.

Do you remember where I put my study guide?

There is an active mountaineering club at my university.

He loves mountain climbing.

He looked up at the mountains and was moved by the beauty of nature.

He was calculating in his head.