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

This picture is fixed to the frame.

This plant needs oxygen to perform photosynthesis.

I learned about the properties of phosphorous acid in chemistry class.

He was calculating in his head.

I have been studying Japanese for three months.

He solved complex mathematical problems using his new calculator.

The triple point of water refers to the special state where the three phases of solid, liquid, and gas coexist.

He decided to become a member of the Communist Party.

He is facing triple difficulties.