让朋友坐在椅子上,头向后仰,你用食指抵在他的前额上并向下压,他就无法站起来,这是为什么呢?滚动比赛开始了,球类派出的选手有铅球、高尔夫球等,圆盘类派出的选手有象棋子、塑料圆盘、圆形杯垫,环类派出的选手有圆环、轮胎、呼啦圈……它们谁的滚动速度最快呢?…………书中的小实验有的像小魔术,有的简直就是一场小恶作剧,个个妙趣横生,有很强的挑战性。阅读这本书,能让我们 Let your friend sit in a chair, head back, you forefinger against his forehead and pressed down, he could not stand up, which is why? The rolling game began, the ball sent the players shot, Golf balls, etc., the players sent by the disk type are chessmen, plastic disks, round coasters, and ring type players have rings, tires, hula hoops ... Whose rolling speed is the fastest? Some of the book’s little experiments like little magic, and some simply a little prank, all the fun, there is a strong challenge. Reading this book will allow us