可以做个邮件来作为提醒，当他们有新的系统通知时候邮件发送告知他们有了新的提醒。这个一来比较耗用服务器资源，而来邮件太频繁也不好 - Can be used as an e-mail reminder when they have a new system of notification when the message is sent to inform them of a new reminder. Compare this one to consume server resource