单词：self oscillatory system
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Broadcast: February 14, 2003 By George Grow This is the VOA Special English Environment Report. President Bush has offered a plan to speed development of technology that uses hydrogen as fuel. His goa
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The Streaming down the Yangtze team is now at Ningbo-Zhoushan Port, which is the starting point of the Maritime Silk Road. In 2017, the port's throughput capacity was registered at 1 billion tons, and was the busiest port in the world in terms of car
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