一十五年前,在一个农村民办中学的简陋教室里,一位农民打扮的小伙子,已经清晰地讲解完了电池的原理,构造和使用。随后,他走到讲台(实际上是一张粗制的木桌)前。上面放着一个小小的收音机,收音机上放着一个比一块豆腐高一点的小木盒,一根导线从盒口上伸出来。他把导线接在收音机上,不一会儿便吱吱喳喳唱起来了。“你们说,这 Fifteen years ago, in a shabby classroom in a rural private middle school, a farmer-dressed man had clearly explained the principle, construction and use of batteries. He then went to the podium (actually a crude wooden table). There was a little radio on it, and a small wooden box a little taller than a tofu stood on the radio, with a wire extending from the mouth of the box. He connected the wire to the radio and soon sang and squeaked. "You say, this