<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区
          您現(xiàn)在的位置: Language Tips> Audio & Video> Special Speed News  
           





           
          A cool way to keep food from spoiling
          [ 2007-11-26 11:22 ]

          Download 

          This is the VOA Special English Development Report.

          A few degrees can make a big difference when it comes to food storage. Foods can go bad if they get too warm. But for many of the world's poor, finding a good way to keep food cool is difficult. Refrigerators are costly and they need electricity.

          Yet spoiled food not only creates health risks but also economic losses. Farmers lose money when they have to throw away products that they cannot sell quickly.

          Mohammed Bah Abba's pot-in-pot cooling system Mohammed Bah Abba's pot-in-pot cooling system But in 1995 a teacher in northern Nigeria named Mohammed Bah Abba found a solution. He developed the "Pot-in-Pot Preservation/Cooling System." It uses two round containers made of clay. A smaller pot is placed inside a larger one.

          The space between the two pots is filled with wet sand. The inner pot can be filled with fruit, vegetables or drinks. A wet cloth covers the whole cooling system.

          Food stored in the smaller pot is kept from spoiling through a simple evaporation process. Water in the sand between the two pots evaporates through the surface of the larger pot, where drier outside air is moving.

          The evaporation process creates a drop in temperature of several degrees. This cools the inner pot and helps keep food safe from harmful bacteria. Some foods can be kept fresh this way for several weeks.

          People throughout Nigeria began using the invention. And it became popular with farmers in other African countries. Mohammed Bah Abba personally financed the first five thousand pot-in-pot systems for his own community and five villages nearby.

          In two thousand, the Rolex Watch Company of Switzerland honored him with the Rolex Award for Enterprise. This award recognizes people trying to develop projects aimed at improving human knowledge and well-being.

          A committee considers projects in science and medicine, technology, exploration and discovery, the environment and cultural history. Winners receive financial assistance to help develop and extend their projects.

          The award is given every two years. The next one will be given in 2008.

          And that's the VOA Special English Development Report, written by Jill Moss. You can learn more about the Rolex Awards at rolexawards.com. And you can learn more about technology and the developing world at voaspecialenglish.com. I'm Steve Ember.

          (Source: VOA 英語點(diǎn)津姍姍編輯)

           
           
          相關(guān)文章 Related Stories
           

           

           

           
           

          本頻道最新推薦

               
            A cool way to keep food from spoiling
            《百萬美元寶貝》精講之二
            sex and the city
            the da vinci code
            sleepless in seattle

          論壇熱貼

               
            “重色輕友”怎么說
            求教The Yellow Brick Road 能否翻譯為"康磚大道"?
            How to say 正版軟件?
            請(qǐng)教“80后”怎么說?
            “鐵板燒”=?
            Six ways to stop dwelling on it(e-c)practice




          主站蜘蛛池模板: 亚洲 欧洲 无码 在线观看| 国产精品无码一区二区三区电影| 欧美产精品一线二线三线| 妖精视频亚州无吗高清版| 人人爱天天做夜夜爽| 国产精品一二三区视在线| 免费人欧美成又黄又爽的视频| 无码内射中文字幕岛国片 | 成人拍拍拍无遮挡免费视频 | 亚洲亚洲人成综合网络| 免费99视频| 国产白嫩护士在线播放| 国产69精品久久久久人妻| 中文字幕国产精品综合| 999热在线精品观看全部| 亚洲区成人综合一区二区| 亚洲国产精品人人做人人爱| 成人欧美一区二区三区在线观看| 影音先锋女人AA鲁色资源| 妺妺窝人体色www聚色窝韩国| 国产精品SM捆绑调教视频| 久久人人97超碰国产精品| av午夜福利一片免费看久久| 国内大量情侣作爱视频| 久久爱在线视频在线观看| 毛片免费观看视频| 国产剧情福利一区二区麻豆| 国产亚洲av手机在线观看| 亚洲中文字字幕精品乱码| 久久久久久久波多野结衣高潮| 乱女乱妇熟女熟妇综合网| 亚洲国产精品一区第二页| 成人自拍小视频免费观看| 久久精品国产清自在天天线| 午夜免费福利小电影| 日本高清视频色WWWWWW色| 色综合久久久久综合体桃花网| 亚洲夜夜欢一区二区三区| 亚洲AV福利天堂在线观看| 精品2020婷婷激情五月| 无码国产精品久久一区免费|