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。

youdao

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。

youdao

Some sources indicate that J-11Bs may soon be equipped with a new active electronically scanned array (AESA) radar that is also likely to be used by the new Chengdu J-10B.

一些信息来源认为J-11B可能很快装备新的主动电子扫描阵列（AESA）雷达并且也有可能被新的成都J-10B采用。

youdao

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