I have been to Ningbo.

My grandparents came from Poland.

The speed of this progressive wave is close to the speed of light.

The telecommunications company temporarily ceased operation of waves for maintenance.

The telecommunications company announced the ceasing operation of waves.

This wave dash indicates the end of a sentence.

During an earthquake, the longitudinal waves arrive first.

In physics, a wave packet refers to a collection of waves.

The study of gravitational waves contributes greatly to our understanding of the universe.

I heat up the meal using a microwave.