单词：area signal system
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Conversation one Do you drive a car yourself? Yes,I just bought new car, I drive to work everyday! Great! When you become new driver,you are better drive as carefully as possible! Sure, I see safety is most important thing! Accident is awful!I will t
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This is Scientific Americans 60-Second Science. I am Cynthia Graber. This will just take a minute. You've probably take you depth perception for granted. It allows you to easily judge distances. Each eye sends a different signal to the brain, and the
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If you work at a big company, usually you are divided into smaller groups that work on the same topic the same type of work. 如果你在大公司上班，一般你会被分到工作类型相同的小组里。 So, there is an accounting section and t
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WAN wide area network WARC World Administrative Radio Consortium WATS Wide-area telecommunications services. See Wide-area telecommunications services. Waveform amplitude (magnitude) versus time repre
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BEIJING, March 13 (Xinhua) -- Both China and U.S. signaled that the world's two biggest economies should explore a road of new-type relations. The new type of relations between major powers should be based on mutual respect, cooperation and seeking w
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BEIJING, Sept. 26 (Xinhuanet) -- Weather forecasts showed that Thursday or Friday might be suitable for launching the Tiangong-1 spacecraft, experts said. The unmanned spacecraft, part of China's first spacecraft rendezvous and docking mission, was s
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