Topology is a branch of mathematics that abstracts and generalizes the concept of space.

This cheese is vacuum packed and can be stored for a long time.

He did aerial photography using a drone.

I burned trash in the yard today.

Today is the day for open burning, so let's burn unnecessary papers.

The air marshal is an important position in the military.

He is serving in the military as a lieutenant.

Looking at the bird flying high in the sky, I felt freedom.

In mathematics, an empty set refers to a set that does not contain any elements.

He made a fake snore to pretend to be asleep.