How does the Russian 3M22 Zircon hypersonic missile compare to China’s Dongfeng DF-21? 俄罗斯3M22锆石高超音速导弹与中国东风DF-21相比如何? I have an unpopular opinion as an engineer with lifelong interest for aviation. 作为一个对航空有终身兴趣的工程师,我的观点不受欢迎。 Scramjets are overated...