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barrier [barriers]▼noun[UK: ˈbæ.riə(r)] [US: ˈbæ.riər]
obstruction [obstructions]▼noun[UK: əb.ˈstrʌk.ʃn̩] [US: əb.ˈstrək.ʃn̩]
chronic obstructive pulmonary disease▼(group of pulmonary diseases)noun
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