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countermark n.1.(金首飾等上的)戳記,刻印。2.(貨物等上的)副...

countermeasure

Security e - mail system also can countermark “ digital postmark “ to justify the accurate time of transfer of the mail 安全電子郵件系統還可為郵件加蓋“數字郵戳” ,使郵件傳送的準確時間得到公正。