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人类一直以羡慕的目光看着鸟儿在空中自由的飞翔,但是我们拥有一种能够翱翔的特殊东西——大脑。靠灵感,靠科学技术,我们人类也照样飞上了天空。比空气轻但比未来光明的气球就像空中水母一样漂浮在大气层中,这是从前的技术,将来也不会消失……