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EARPHONE can make us hear each other clearly even in terribly noisy spots. In most situation, the sounds we want come from
the front or the flanks of us. So the earphone will take the sound from our back as noise. It will remove the noise from all
sounds, then we can hear the useful sounds.


ZheJiang University

ZheJiang University
HangZhou, China


ZheJiang University

ZheJiang University
HangZhou, China

Lin Ge Zhe Zhang Congying Chen Qiyan Zhai