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powerful▼(having or capable of exerting power, potency or influence)adjective[UK: ˈpaʊə.fəl] [US: ˈpaʊər.fəl]
efficient▼(using a particular proportion of available energy)adjective[UK: ɪ.ˈfɪʃnt] [US: ə.ˈfɪ.ʃənt]
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