ectral de ityspectral densityspectraldensityspectrum density谱: table; chart; register密度: density; thickness发射谱密度: emission spectral density功率谱密度: power spectral density (psd); psd ( power spectral density ); psd power spectral density; psd,power spectrum density; spectral density功谱密度: power spectral density下载手机词典可随时随地查词查翻译