Sound-cancelling works by analysing any unwanted frequencies and then producing counteracting ones.
声音消除系统通过对人们不希望听到的声音频率进行分析，制造出中和声。
Noise-cancelling microphone enhances sound quality and voice-dialing performance.
降噪麦克风提高音质和语音拨号的性能。
Noise-cancelling microphone enhances sound quality and voice-dialing performance.
降噪麦克风提高音质和语音拨号的性能。
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