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* Wallpaper is a background picture used to display on the desktop. To put it bluntly, wallpaper is also a picture, which is the background picture displayed on your desktop.
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Therefore, the picture contains wallpaper, and wallpaper is a kind of picture.
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Advantages and disadvantages? Not all pictures are suitable for wallpaper, but the size should be appropriate. Otherwise, if the small picture is used as wallpaper, the whole desktop display will be very vague.
You got it?