The results show that the spectral centroid of the backscatterer signals is dowushifted to lower frequency with increase of the apparent density of cancellous bone.是什么意思_The results show that the spectral centroid of the backscatterer signals is dowushifted to lower frequency with increase of the apparent density of cancellous bone.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句