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现代，简单，整洁的设计 1长宽比（4：3） 格式：PowerPoint（.pptx）-与Microsoft PowerPoint 2016一起设计 干净的风格
Water is the driving force of all nature. - Leonardo da Vinci When the water starts boiling it is foolish to turn off the heat. - Nelson Mandela Truth will rise above falsehood as oil above water. - Miguel de Cervantes
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