空中 (kōng zhōng): trong bầu trời

Autumn has arrived, and fallen leaves are everywhere in the park; little golden leaves are dancing in the air.

That eagle circled in the sky for a long time, then suddenly dove down and caught a rabbit.

On New Year's Eve, fireworks exploded in the sky, and their colorful light lit up the whole city.

After the plane took off, I looked out the window and saw white clouds drifting slowly in the sky.

The children were flying kites on the playground, and the colorful kites flew higher and higher in the sky.