This problem falls into the category of mathematics.

This brass vase is very beautiful.

Winter swimming in the dead of winter is a harsh sport that tests physical and mental strength.

I often go camping in the mountains on weekends.

This book is an annotated edition of his work.

Rikuchū is a former place name in Japan, referring to a part of present-day Iwate Prefecture.

There are many marginal notes on the pages of this book.

A block of small-sized text has been added at the bottom of this page.

Mail arrived while I was away from home.

My father's hobby is breeding Ranchu.