The electrons in the upper band eventually release energy, thereby emitting photons.

上层能带中的电子最后会发射光子释放能量。

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On Friday, the stock dipped below the upper band of our buy zone for a short-term trade.

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Constricting bollinger bands indicate the potential for an increase in volatility that could trigger a breakout, and the proximity to the upper band suggests an overbought position.

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The DoJ is encouraging the FCC to ensure that a majority of the spectrum being recovered from over-the-air television broadcasters in the 600 MHz. bands go to the two carriers with the largest swathes of upper band spectrum.

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