J20抄袭F47的鸭翼设计
https://www.reddit.com/r/China_irl/comments/1jh07bu/j20%E6%8A%84%E8%A2%ADf47%E7%9A%84%E9%B8%AD%E7%BF%BC%E8%AE%BE%E8%AE%A1/
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