美国空军开始在爱德华斯空军基地进行B-21突击隐形轰炸机飞行测试。 U.S. Air Force begins B-21 Raider stealth bomber flight testing at Edwards Air Force Base.

美国空军已开始在爱德华斯空军基地对一架6.94亿美元的隐形核轰炸机B-21突击机进行飞行试验。 The U.S. Air Force has commenced flight testing of the B-21 Raider, a $694 million stealth nuclear bomber, at Edwards Air Force Base. B-21型轰炸机旨在取代B-1和B-2型轰炸机,可同时运载常规弹药和核弹药。 Designed to replace the B-1 and B-2 bombers, the B-21 can deliver both conventional and nuclear munitions. 其生产目标至少为100架飞机,预计到2020年代中期将投入运行。 With a production goal of at least 100 aircraft, it's expected to be operational by the mid-2020s. 该方案在成本和绩效方面进展顺利,利用先进的制造技术提高生产效率。 The program is on track regarding cost and performance, utilizing advanced manufacturing technologies for efficient production.