Unverified50% confidenceDecision RuleTime unknown
耳塞的降噪能力看NRR值（Noise Reduction Rating）：NRR≥30dB适合飞机/工地等强噪音环境，NRR 22-28dB适合宿舍、火车、酒店等中等噪音场景，日常午睡NRR 20dB左右即够用
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