What is this box used for?

My grandfather underwent cataract surgery.

Looking out the window, there was a rain shower.

He is a famous painter.

He is learning the technique of beating gold.

I want to see the midnight sun at least once.

I bought a new broom to clean my room.

He is known as an erudite person.

He takes pride in his erudition in that field.

Baihe County is one of the beautiful places in China.