In vowels and voiced fricatives, voicing obscures the aspiration and frication components.
In the latest in the case believing that Mabel obscures his positionality.
After Cyprian's day this view gains ground in the West, and almost obscures the older view that the rite is primarily an act of communion with Christ.
It is true that some specialized forms, such as the Brisingidae among starfish, A strophiura and Ophioteresis among ophiurans, contravene the usual diagnoses; but this neither obscures their systematic position, nor does it alter the fact that since early Palaeozoic times these two great groups of stellate echinoderms have evolved along separate lines.
It is also attenuated by dust, smoke, cloud or any medium which obscures radiation at that wavelength.