前几天，一篇名为《跳蚤与爬蚤》的文章让我颇有感触。文中讲了这样一个故事：科学家曾做过一个实验，把一只跳蚤放到桌上。开始时，跳蚤能跳到自己身高的一百倍以上。后来，把一只玻璃罩子放到跳蚤头顶，跳蚤跳起后，由于几次碰壁，不得不主动调节所跳的高度。最后，不断调低 A few days ago, an article titled “Fleas and Crawlers” made me feel quite touched. The story is told in the article: Scientists have done an experiment and put a flea on the table. At the beginning, fleas can jump more than a hundred times their height. Later, after placing a glass cover on the top of the fleas and jumped from the fleas, he had to actively adjust the height of the jump because of a few wall collisions. Finally, keep down