单词：energy band
energy band的用法和样例：
例句
- 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。
- The highest-energy band containing electrons is called the valence band, and the next higher one is the conduction band.填有电子而能量最高的能带称为价带，相邻的更高能带称为导带。
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