This category includes the background image or background image layout of the desktop. 此类别包括桌面的背景图像或背景图像布局。
The electrophotographic method in which the image elements remain unexposed while the nonimage, or background, areas are exposed to light, usually laser light. 中义电子摄影成像方式，印纹部份未曝光，而非印纹或背景部份接受曝光。
