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noise barrier
construct.	barreira antirruído
environ.	barreira acústica; barreira de proteção; barreira protetora; barreira de insonorização; barreiras acústicas
noise barrier Barriers for reducing the propagation of sound: they are widely used in industry and alongside roads and railways to shield receivers from noise sources. Barriers will not reduce the noise on the receivers side, but will increase it, unless the barrier is also covered in absorbing material
environ.	barreiras acústicas

noise barrier: 3 phrases in 2 subjects

Health care	2
Transport	1