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2016英语四级篇章词汇阅读篇NO.9免费下载，
Through the videocenferencing, not only your voice but also your face, the surroundings and any other graphic and phisical __1__ can be captured and transmitted through the communication system with or without wires. Of course, when you go into the details, the technology involved is very __2__ a
2016英语四级篇章词汇阅读篇NO.9
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