噪音减弱等级,降低噪声级的英文

noise reduction rating

• 噪音:    noise; undesired s ...
• 减弱:    attenuate; fade; w ...
• 等级:    grade; rank
• 降低:    reduce; cut down; ...
• 噪声:    noise; stew; swish ...
• 级:    level; rank; grade