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诺思罗普-格鲁曼公司在自己的网站上吹嘘说，“精灵”B-２隐形轰炸机几乎是看不见的，因为该机的复合材料和蝙蝠形状的设计使其难以被雷达发现。
Vaunted1) Technology: Stealth2) Avionics3)
Northrop Grumman Corp．（NGC）boasts4) on its Web site the B－２spirit stealth bomber5) is nearly invisible．Because the plane’s composite materials and bat－shaped design make it hard for radar6) to pick up．However，in １９９９，an F－１１７，which also has a stealthy shape and materials，was blasted out of the sky over the Balkans．Stealth technology is hardly a sham．It shrinks the radar“signature”of a plane．If a conventional aircraft makes a blip on radar screens at ２００kilometers，a stealthy plane wouldn’ t appear until it was ３４km away．The point is，radar does eventually detect the plane．Weather can also present a problem．The B－２’s materials were tested at Edwards Air Force Base，where it rarely rains．But when the high－tech bombers got drenched7) during missions in the Balkans，the tape used to fill seams in the composite skin often came loose．That en larges the radar signature．
