υδροηλεκτρικό φράγμα, ποτάμι, δέντρα, δάσος, νερό, φράγμα, βουνά, ηλεκτρική ενέργεια, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, υδροηλεκτρική ενέργεια, γεννήτρια
Public Domain
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