Unverified70% confidenceCautionTime unknown
不建议为遮盖持续性低频噪音（如空调外机、交通轰鸣）购买普通白噪音机，应选专门带粉红噪音/棕色噪音（pink/brown noise）功能的机型，其低频能量更匹配
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70%
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