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reduction of gear ratio▼[UK: rɪ.ˈdʌk.ʃn̩ əv ɡɪə(r) ˈreɪ.ʃɪəʊ] [US: rə.ˈdək.ʃn̩ əv ˈɡɪr ˈreɪ.ʃiˌo.ʊ]
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