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So the frequency for this magnesium bar is about 2,100 Hertz, and you can hear that.
所以镁条的频率是，大概2100赫兹，你可以听到。
youdao
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You should check all the frequency allocations for your area.
您应该检查所有频率分派您的区域。
youdao
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You should check all the frequency allocations for your area.
您应该检查所有频率分派您的区域。
youdao