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图片尺寸542x407![[overhead projector gallery image]](https://i.ecywang.com/upload/1/img2.baidu.com/it/u=4047945497,1106619225&fm=253&fmt=auto&app=138&f=PNG?w=252&h=320)
[overhead projector gallery image]
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![[overhead projector gallery image]](https://m.videomathtutor.com/Printshop/Printshop/OverheadPDFs_files/stacks_image_21809.png)
