Mr. Hisataka is my best friend.

I learned about the properties of arsenate in chemistry class.

We will use arsenic acid in this chemistry experiment.

He felt that his origin was humble.

His humbleness made him a very popular person among people.

She is always the best subject of a photograph.

The water caltrop is a beautiful plant that floats on the water surface.

She quietly called his name.

He admitted that he is a masochist.

When handling arsenious acid in a chemical experiment, you must be very careful.