The crawling baby is playing in the living room.

A phonon is a physical concept that represents the vibration of a crystal lattice.

The piston of the engine is moving.

The boy is playing in the park.

Liezi was a Taoist philosopher.

Mozi's thoughts had a great influence on ancient Chinese philosophy.

He finished his work and went home at midnight.

The children are playing in the park.

When I saw the yellow bunting for the first time, I was surprised by its beauty.

A yellow bunting flew into the garden and showed me its beautiful yellow feathers.