步骤 1：导出为 HTML
内容->导出备份->导出到 HTML ，选择“全部”
第 2 步：下载并安装 caliber
下载地址： https://calibre-ebook.com/download
步骤 3：将 HTML 转换为电子书
3.1.点击“添加书籍”，选择第一步下载的HTML文件。
3.2. 点击“转换书籍”，然后在输出格式中选择“PDF”，点击“确定”
3.3.文件生成后，右键选择“打开书籍文件夹”
菜单
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