单词：screw concrete spraying machine
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Unit 9 DIALOGUE I I Wish I Had a Robot A: What would you wish for if I let you make a wish? B: I'd wish I had a robot. A: Why a robot, of all things? B: A robot is clever, capable, efficient, and obed
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Dallas Continues Spraying in Fight Against West Nile Fever Many people in Dallas continue to work and play outdoors, but they are heeding warnings from health officials to protect themselves. Fifteen-year-old Macias says he has followed the news repo
VOA标准英语2012年(八月)
In the mid 1800s, a man in France and a man in Massachusetts both came up with ways to record soundbut as a pattern on paper much the way the dots and dashes of Morse code look on paper. Nobody had figured out how to record sounds and play them back
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Spraying Insecticide Indoors Reduces Spread of Malaria Researchers in West Africa have shown that spraying insecticide indoors can dramatically reduce malaria transmission. Efforts to develop a malaria vaccine have so far been disappointing, so progr
VOA标准英语2011年(十月)
DALLAS Officials in Dallas, Texas and the surrounding county of the same name are continuing to spray by land and air in an effort to suppress mosquitoes that spread the West Nile virus. Health officials have reported more than 200 cases of fever cau
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