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arduous▼(needing or using up much energy)adjective[UK: ˈɑː.djuəs] [US: ˈɑːr.dʒuːəs]
advance [advanced, advancing, advances]▼(to raise to a higher point; to enhance; to raise in rate)verb[UK: əd.ˈvɑːns] [US: əd.ˈvæns]
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