求翻译：　1。简单易用、准确快速电子贺卡不仅可以让不同操作系统、不同邮件软件的用户都能看到同一张贺卡，更可以让您确切知道对方是否看到了您的贺卡。因为网站服务器系统在收卡人观看了此张贺卡后会自动通知发卡人。是什么意思？

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