美国人老抱怨中国间谍，你有本事抓出一个来看看，当初美国抓了不少苏联间谍的。

Indeed some senior U.S. aviators believe that the J-31—which is thought by many U.S. military 
and industry officials to be based on stolen F-22 and F-35 technology—will eventually be the 
equal of the American fighters. “I think they’ll eventually be on par with our fifth-gen 
jets—as they should be, because industrial espionage is alive and well,” as one senior pilot 
familiar with the F-35 told USNI News.