You can exchange numerous messages in the time it would take to send one piece of mail via the post office or even via one of the express document delivery services.

 
  • 在通過(guò)郵局或某種快件服務(wù),發(fā)送一件郵件所花費的時(shí)間內,如果采用e-mail則可交換大批量的信息。
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