() () blind carbon copya copy of an email message sent to sb without showing their name, so that the main person that the email is addressed to does not know that the message has also been sent to the other person秘密抄送（将电子邮件同时寄给其他人，但将这些人的身份隐藏起来，使收件者不知道寄给他的信还同时寄给其他人）➡carbon copy