小芝麻是个聪明的孩子,这天中午吃过饭,他迷迷糊糊睡着了,在睡梦中,他来到了真空王国。他轻轻推开了真空王国的大门。展现在他眼前的是一个火树银花的世界:漆黑一团的夜空中不断地产生一个个耀眼的光球,它们一个个快速地在空中飞舞,有的眼看就要撞到小芝麻头上,可又莫明其妙地突然消失在黑暗中。有的光球会在飞行中突然化为两个黝黑的圆球,这两个球在飞行中撞上从别处飞来的同样黝黑的圆球,“嘭”的一声,它们又化着了一个耀眼的光球……“这怎么能叫真空?”小芝麻低声说道。“还不如叫它一锅沸水呢!”“不,小芝麻,这就是真空!”忽然,从空中一个光球里伸出一条长长 Small sesame is a smart child, eaten at noon that day, he was asleep and fell asleep, in his sleep, he came to the Kingdom of the vacuum. He gently pushed the door of the vacuum kingdom. Show in front of him is a world of fireworks: a dark mass of the night sky constantly produce a bright ball of light, one by one in the air flying quickly, and some will have to hit the head of small sesame seeds, but also Suddenly disappeared in the dark, inexplicably. Some lightballs suddenly burst into two darkballs during flight, and these two balls hit the same darkballs coming from elsewhere in flight, “嘭 ” A bright light ball ... ... “How can this be a vacuum?” Small sesame whispered. “Not as good as a pot of boiling water it! ” “No, small sesame seeds, this is a vacuum!” Suddenly, a light ball from the air out of a long