题主说到的这个问题，应该算是历史遗留问题啦~~ 因为在最新的microsoft 365中（每年缴纳订阅费的ppt），ppt已经提供了支持直接 修改图片透明度 的选项，如下图所示，有图有真相！
38 Minimalist Halloween Decor Ideas Simple, Modern, and Stylish
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