File:幻灯片7.jpg
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![File:幻灯片7.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d6/%E5%B9%BB%E7%81%AF%E7%89%877.jpg/800px-%E5%B9%BB%E7%81%AF%E7%89%877.jpg?20131225061826)
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