美国科学家称,他们可能在三年内研制成一种极小的间谍飞机。这种被称为“微型飞鸟”的飞机,翼展不过15厘米,重量不到100克。机上载有微型摄像机,可用来执行侦察任务,也可在火灾中或地震区寻找幸存者。目前,研制人员正致力于导航系统、合适的发动机和飞机外观等方面的研究。尽管某些型号的“微型飞鸟”将使用螺旋桨,麻省理工学院的研究人员仍在研制一种微型涡轮喷气发动机。他们认为,如果“微型飞鸟”要进入地震区或火灾现场搜寻幸存者,使用螺旋桨将是 U.S. scientists say they may develop a tiny spy plane within three years. This aircraft, known as a “miniature bird,” has a wingspan of 15 centimeters and weighs less than 100 grams. The machine carries a miniature camera that can be used to perform reconnaissance missions and to find survivors in fire or in seismic zones. At present, researchers are working on navigation systems, the appropriate engine and the appearance of the aircraft. Although some models of “miniature birds” will use propellers, MIT researchers are still developing a miniature turbojet engine. They think using a propeller would be if “miniature birds” were to search for survivors in the quake zone or at a fire site