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impermeability▼◼◼◼noun[UK: ɪm.ˌpɜː.mjə.ˈbɪ.lɪ.tɪ] [US: ɪm.ˌpɜː.mjə.ˈbɪ.lɪ.tɪ]
opacity [opacities]▼◼◼◼noun[UK: əʊ.ˈpæ.sɪ.ti] [US: oʊ.ˈpæ.sɪ.ti]
air impermeability▼noun
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