单词:electrostatic focusing TWT
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Scientists: Spiders Use Electric Fields to Move through Air Scientists have long wondered how spiders can use the webbing they make to fly. The 19th century English naturalist Charles Darwin commented on their behavior when very small spiders landed
The development of the digital economy and advancements of new technology are expected to bring more opportunities to small and medium enterprises, or SMEs, through globalization on an electronic world trade platform. (Abbreviated version of audio re
THE MAKING OF A NATION - Competition Drives Industrial Growth In the Late 1800s By Frank Beardsley Broadcast: Thursday, November 10, 2005 (MUSIC) VOICE ONE: THE MAKING OF A NATION -- a program in Spec
By Michael Bowman Washington 07 March 2006 view Global Population report By 2050, world population is projected to reach nine billion people. That would constitute a 38 percent jump from today's popul
By Steve Herman New Delhi 26 November 2007 The United Nations wants its upcoming conference on climate change in Bali to devise a uniform strategy for reducing greenhouse gas emissions. India, with a booming economy and a billion-plus population, is
By Paula Wolfson White House 16 April 2008 President Bush says the United States will strive to stop the growth of greenhouse gas emissions by 2025. VOA's Paula Wolfson reports the pledge came as representatives of 17 countries headed to Paris for ta