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redução do ruído
environ.	diminution du bruit; réduction du bruit (indústria); atténuation de bruit
phys.sc., environ., tech.	amortissement du son; atténuation du bruit; insonorisation f
transp., avia.	antibruit m; procédures antibruit

redução do ruído: 6 phrases in 4 subjects

Communications	1
Electronics	1
Environment	3
Health care	1