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Spectrograms show Kosik's voice frequency when he makes human sounds is similar to his keeper's.
通过声谱图对比发现,科希克发出的声音频率与饲养员金中干的非常相似.
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Double voice frequency signal: Every number is represented by two signals that are different in frequency.
双音频信号: 每个数字均由两个频率的信号叠加组成.
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