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This is a PPT background picture of the mountains under the night;
Keywords: Night, night sky PowerPoint background pictures, mountain peaks, mountains slide background pictures
Introduction: geometric triangle art puzzle, geometric triangle cutt...
Introduction: work summary plan ppt template, work overview, work co...
Introduction: The book on the wood grain desktop, the large picture ...
Introduction: Work summary plan ppt template, work overview, work co...
Brief introduction: doctor hat, pencil, notepad, small flower, noteb...
Introduction: The university is a book, library library, university ...