单词:calcinus elegans
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Worms seem like strange animals to send to the International Space Station. It's not like astronauts are going to take time off to go fishing and need to bait their hooks. So why send worms? Believe it or not, scientists are using a microscopic worm,
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SCIENCE IN THE NEWS - October 22, 2002: Nobel Science Prizes By George Grow VOICE ONE: This is Steve Ember. VOICE TWO: And this is Bob Doughty with SCIENCE IN THE NEWS, a VOA Special English program a
Online Virtual World Program a Resource for Farmers 在线虚拟教程传递农业新技术 In a fast-changing world beset by unpredictable climate conditions, farmers cannot afford to ignore new technology. 面对当下变化无常的气候条件,农