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driving force▼noun[UK: ˈdraɪ.vɪŋ.fɔːs] [US: ˈdraɪ.vɪŋ.fɔːs]
motive power▼noun[UK: ˈməʊ.tɪv ˈpaʊə(r)] [US: ˈmoʊ.tɪv ˈpaʊər]
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