" To attach a document" means to add to your email message, usually another file, often a word processing file – a Microsoft Word file, for example, or a Microsoft Excel file.
“附加文档” 是指添加到您的电子邮件消息中, 通常是另一个文件, 通常是文字处理文件——例如 Microsoft Word 文件或 Microsoft Excel 文件。