Now most sound absorption layers are impedance transition constructs, which have been used widely, but their thickness is limit and cannot meet the need of absorbing sound at low frequency.
现代应用较多的吸声层大部分是阻抗过渡式结构，但是厚度有限，无法满足低频吸声的要求。
2
Visible light absorbing compounds can also occur from one electronic atom to another atom arising from the transition charge transfer absorption bands in charge transitions.
化合物吸收可见光还可以发生电子从一个原子到另一个原子的跃迁而产生荷移吸收带发生电荷跃迁。
3
Abstract: This paper explained the formation mechanism of China's excess capacity in transition period by building a absorbing model.