... 1.1351 声影区 sound shadow 1.1352 有源减噪 active sound reduction 1.1353 标准噪声源 reference sound source ...
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The result is a pair of intelligent, high-fidelity active sound-reduction earplugs that allow natural hearing when sound is safe and provide automatic protection from both loud, sustained music and sudden, loud percussive sounds.
ENGADGET: Etymotic Music?Pro 9-15 earplugs bring high-end hush to audiences, lets us enjoy speed metal safely
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