食品保鲜新方法(1)
本期节目主持人向大家介绍了一种食物保鲜的新方法，大家也许可以一试http://t1.g.hjfile.cn/voasp/rm/2007/02/20070228.mp3Before refrigerators, homes usually had ice boxes. But another way to keep food cool without the need for electricity is to use an evaporative cooler. This is easy to make and does not even use ice.A common design is a tall box with food placed on several shelves inside. The shelves are pieces of m…
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