同学们都知道,苍蝇是“四害”之一,是不受人们欢迎的。但现在,许多生物研究所的科学家却以前所未有的热情在关注它。因为它个头小,却能以40公里的时速飞行;一旦发现情况,能在3％秒的瞬间迅速起飞。加州大学的一位生物学家对它的评价是:“苍蝇是所有飞虫中飞行最稳定、机动性能最佳的。在动物世界,苍蝇就是喷气式战斗机。” As the students all know, the fly is one of the “four evils” and it is not welcomed by people. But now, scientists at many biological institutes are paying attention to it with unprecedented enthusiasm. Because it is small, it can fly at a speed of 40 kilometers per hour; once it is found, it can take off quickly in 3% seconds. A biologist at the University of California, California, commented that it is: “Flies are the most stable and most mobile of all flying insects. In the animal world, flies are jet fighters.”