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轻松定制 100％完全可编辑的PowerPoint幻灯片 形状：完全可编辑的矢量图形
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -Albert Einstein Look at the sky. We are not alone. The whole universe is friendly to us and conspires only to give the best to those who dream and work. -A. P. J. Abdul Kalam
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