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This is a PPT background picture related to the Silk Road. Free download of natural scenery slideshow background pictures;
Keywords: camel slide background image, desert PowerPoint background image
Circle spot creative, simple and refreshing gray style ppt template ...
Line drawing city abstract painting background, city background mini...
Warm flowers, noble purple flower background, warm and elegant purpl...
what? Who do you ask? Oh, you want to know what else we can give you...
Colorful cubes with a sense of three-dimensional space, colorful shu...
Introduction, research methods and ideas, key technology and practic...