Imagine that the heavy positive ions of the crystal lattice are held in place by strong springs (the chemical bonds).

 
  • 想像在晶格中,質(zhì)量比較大的正離子被強力彈簧(代表化學(xué)鍵)所束縛,而熱能會(huì )激發(fā)離子以某些特定的頻率振動(dòng)。
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