Superheterodynes are devices used in radios to change the frequency of signals.
Superheterodynes are important for radios to work well.
Examples:
The superheterodynes in the radio help it pick up different stations.
The superheterodynes make the radio sound better.
He fixed the radio by replacing the old superheterodynes.
The superheterodynes are like the ears of the radio, they help it hear better.
Without the superheterodynes, the radio wouldn't work at all.
The superheterodynes are the secret to the radio's magic.