同学们在学习有关失重的知识时,常常会听到老师讲述这样一个非常有趣的故事:美国太空总署为了解决宇航员在太空完全失重状态下的书写问题,花费几百万美元研究专用书写工具——太空水笔,结果以失败告终。因此美国太空总署的研究人员感到很难堪,他们不得不出重金征求能解决这个问题的高手。一天,太空总署收到了一个小朋友的来 When students learn about weightlessness, they often hear the teacher tell us a very interesting story: NASA spent millions of dollars on special writing instruments in order to solve the writing problem of astronauts in total weightlessness in space. - space pen, the result ended in failure. As a result, NASA researchers feel embarrassed that they have to spend heavily to solicit experts who can solve the problem. One day, NASA received a little friend