The Physical Optics (PO) method is used to predict the RCS of complex targets, in this instance the Chengdu J-20 prototype.

物理光学（PO）方法被用来预测复杂目标，也就是成都歼20原型机的RCS。

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Fisher in particular pointed to the Chengdu J-20's stealth technology and ability to super cruise, or fly supersonically without using fuel-guzzling afterburners.

特别是费舍尔指出，成都J - 20的超级隐形技术和能力的邮轮，不使用燃料的大量消耗加力超音速。

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The test flight of the J-20 stealth jet fighter in Chengdu, Sichuan, has been widely reported on Chinese Internet blogs and online news sites.

国内很多博客和新闻网站都发布了歼20隐形战机在四川成都试飞成功的消息。

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However the unveiling of the Chengdu J-20 is believed to bring China into the restricted ranks of those countries able to build a fifth-generation radar-evading or "stealth" fighter.

BBC: China extending military reach