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blind courtesy copy
multimed.	密送
proj.manag.	密件抄送; 暗送 (bcc)
telecom.	隐名副本; 隐蔽副本收件人看不到其他收件人姓名的电子邮件; 隐名副本 (bcc); 隐蔽副本 (bcc); 收件人看不到其他收件人姓名的电子邮件 (bcc)