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Life is like riding a bicycle. To keep your balance, you must keep moving. -Albert Einstein One of the most important days of my life was when I learned to ride a bicycle. -Michael Palin Riding a bicycle is the summit of human endeavor an almost neutral environmental effect coupled with the ability to travel substantial distances without disturbing anybody. The bike is the perfect marriage of technology and human energy. -Jeremy Corbyn
快速轻松地自定义 容易改变颜色 易于编辑的数据驱动图表（饼图，条形图，折线图） 免费图片和艺术品 格式：PowerPoint（.pptx）-与Microsoft PowerPoint 2016一起设计 非动画
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