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The mother didn't realize the child was within hearing range.
母亲没有意识到孩子就在旁边，听得见。
youdao
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The unit generates noise at all frequencies across the human hearing range.
它能产生所有频率的声音，覆盖了整个人类的听力范围。
youdao
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The unit generates noise at all frequencies across the human hearing range.
它能产生所有频率的声音，覆盖了整个人类的听力范围。
youdao