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Từ điển Máy Tính - Foldoc Dictionary

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1. The portion of a packet, preceding the actual data, containing source and destination addresses, error checking and other fields.

2. The part of an electronic mail message or news article that precedes the body of a message and contains, among other things, the sender's name and e-mail address and the date and time the message was sent.

• Từ đồng nghĩa / Synonyms:
  coping, cope, lintel, heading, head