美国空军收到第二架B-21突袭式隐形轰炸机,为未来的机队进行预先测试。 US Air Force receives second B-21 Raider stealth bomber, advancing testing for future fleet.

美国空军收到第二架B-21突击隐形轰炸机,推进其测试计划。 The US Air Force received its second B-21 Raider stealth bomber, advancing its testing program. 由Northrop Grumman建造的这架飞机成功地完成了第一次从加利福尼亚起飞的航班,将有助于测试飞行任务系统和武器集成。 The aircraft, built by Northrop Grumman, successfully completed its first flight from California and will help test mission systems and weapons integration. 空军计划购买100架B-21轰炸机,以取代B-1和B-2等老式飞机。 The Air Force plans to purchase 100 B-21 bombers to replace older models like the B-1 and B-2. 这一发展是空军现代化和提高其核能力和战斗效力战略的一部分。 This development is part of the Air Force's strategy to modernize and enhance its nuclear capabilities and combat effectiveness.