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WS-15が完成してないのに？アホアホアホアホアホwww

　https://www.scmp.com/news/china/military/article/3024584/chinas-navy-set-pick-j-20-stealth-jets-its-next-generation
　The WS-15 engine that has been purpose built for the J-20 has undergone hundreds of hours of testing but has yet to meet reliability targets
　while the F-31 prototype does not have a purpose-built engine.