ενέργεια, στροφή, αχλάδι, ενεργειακή επανάσταση, λάμπα, ήλιος, ηλιακή ενέργεια, φως, πυρηνική φάση, κίτρινος, ζήτηση ηλεκτρικής ενέργειας
Public Domain
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