每当我看到常识课老师手里端着一个笨重的地球仪,很费力地走进教室上课时,我就觉得这种地球仪既浪费木材,又不便携带。我老在想,能否将这种地球仪进行改进呢?有一天,我和同学们一道玩气球的时候,突然想到,能不能将木制的地 Every time I saw a bulky globe in the hands of a common sense teacher, I spent a lot of time trying to walk into the classroom. I thought this globe was a waste of wood and inconvenient to carry. I always wondered, can this globe be improved? One day, when I and my classmates playing a balloon, suddenly thought, can not be wooden