1)spectral power density,谱能密度2)energy density spectrum,能量密度谱3)wave power density spectrum,波能密度谱4)cross-energy density spectrum,互能密度谱5)energy spectral density,能量谱密度6)power spectrum,谱密度，能谱;功率谱，能潜
用法和例句
The energy density spectrum and secular variation of the Earth s main magnetic Field;