if (leftArr[i] <= arr[mid + j]) {
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在「开箱即用」这个场景下，Seede 最终生成的 PPT 质量差强人意，内容丰富度上明显不足。使用更具体的提示词，应该能够获得更好的效果。导出时会包含右下角的水印图标，但是可以在 PPT 中手动删除。