He wrote a poem using the four treasures of the study.

An arc discharge occurs when electricity passes through the air.

Trigonometry is a branch of mathematics that studies the relationship between angles and triangles.

We like to watch satellite broadcasting at home.

Phoenix is one of the constellations in the southern hemisphere.

When he opened the supernatural box, an astonishing power was released.

You can use spectroscopy to examine the components of a substance.

There were many people gathering, and the park was bustling.

He is a generous person.

Tom is my best friend.