“不要乱扔垃圾。”从我们知道什么是垃圾开始,就有人不厌其烦地向我们灌输这个理念。这句话还经常出现在学生手册上面,时刻提醒我们:垃圾要正确存放。尽管我们中的一些人做得不太好,但至少我们知道,看到草地上的废纸或饮料瓶该怎么办——捡起来并放进垃圾箱。但是,如果是漂浮在几千米高空的垃圾,我们该怎么办?随着科技的发展,更多的人造卫星被送上太空,这 “Do not litter. ” From the beginning we know what is rubbish, some people take the trouble to instill this concept to us. This sentence often appears in the student manual above, always remind us: garbage should be properly stored. Although some of us are not doing well, at least we know what to do when we see paper or beverage bottles in the grass - pick it up and put it in the trash. However, what should we do if it is rubbish floating at a height of several kilometers? With the development of science and technology, more satellites are sent to space, which