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1.The sound irradiator was used to create a soothing background noise.
这个声辐射器被用来创造一个舒缓的背景噪音。
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2. The sound irradiator was designed to improve the quality of audio recordings.
这个声辐射器被设计来提高音频录制的质量。
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3. The sound irradiator was used to test the effectiveness of new hearing aids.
这个声辐射器被用来测试新助听器的有效性。