有一次,发明大王爱迪生和他的助手们制作了一个电灯泡。那是他们辛苦工作了一天一夜的劳动成果。随后,爱迪生让一名年轻学徒将这个灯泡拿到楼上另一个实验室。这名学徒从爱迪生手里接过灯泡,小心翼翼地一步一步走上楼梯,生怕手里的这个新玩意儿滑落。但他越是这样想,心里就越紧 Once, Edison, the inventor, and his assistants produced a light bulb. It was the result of the labor they worked hard day and night. Later, Edison asked a young apprentice to take this light bulb to another laboratory upstairs. The apprentice took the light bulb from Edison and walked cautiously up the stairs step by step, for fear that the new thing in his hand had slipped. But the more he thinks, the tighter his mind becomes.