δέντρο, πλέγμα, δίκτυο, τεχνολογία, πράσινος, βιοτεχνολογία, επιχείρηση, βιωσιμότητα, περιβάλλον, την προστασία του περιβάλλοντος, φυσικό απόθεμα
Public Domain
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