HCI研究人员说下一代邮件过滤器是能够延迟通知和发送某些电邮的“分级”过滤器，以免打扰接收者。
The next generation of E-mail filters, say HCI researchers, will be "gradation" filters that delay notification or delivery of certain e-mails to avoid bothering the recipient.
该公式显示，系统分级越多，同步信号的时间延迟越大。
This formula reveals that more levels in system structure would lead to more delay.
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