Daily Vocabulary - Drone(v) Make a continuous low humming sound. Synonyms: hum, buzz, whir, vibrate, murmur Example: "we heard a plane droning overhead" | Facebook
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Unmanned Aerial Systems: Theoretical Foundation and Applications (Advances in Nonlinear Dynamics and Chaos (ANDC)) (English Edition) eBook : Koubaa, Anis, Azar, Ahmad Taher: Amazon.fr: Boutique Kindle
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