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20多年前,美国科学家就开始在军事上探索这样一类梦想:研究出一种能使飞机不被雷达发现的装置。现在他们终于把这种装置搞起来了。
More than 20 years ago, scientists in the United States began to explore the military dream of developing a device that would keep the aircraft from being detected by radar. Now they finally got this device up.