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Beijing will launch a pilot program to equip schools and kindergartens with air filtration devices. Smog has been a significant issue in the Chinese capital this winter. I was coughing just now, I always wear mask, from school to home. The air is cho
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By Tabinda Naeem Washington, D.C. 21 May 2007 Two years ago, the National Academy of Engineering established the Grainger Challenge Prize for Sustainability. This $1 million award was designed to challenge the world's scientists to develop a practica
今天我们要讲的习惯用语都有air这个词。大家都知道air是空气。早在十七世纪,意大利科学家伽利略发现空气似乎没有实质却有重量。后来人们进一步发现高山顶上的空气要比海平面上的空气