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Even if one tree falls down it wouldn't affect the entire forest. - Chen Shui-bian The clearest way into the Universe is through a forest wilderness. - John Muir
聪明创新的演示幻灯片 在PowerPoint中易于编辑 演示照片包括在内; 易于编辑的数据驱动图表(饼图,条形图,折线图)
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