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breakthrough [breakthroughs]▼(major progress)noun[UK: ˈbreɪk.θruː] [US: ˈbreɪk.ˌθruː]
improvement [improvements]▼(act of improving)noun[UK: ɪm.ˈpruːv.mənt] [US: ˌɪm.ˈpruːv.mənt]
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