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並前往https://www.latimes.com/business/story/2019-08-20/northrop-b2-b21-stealth-bomber-palmdale

Northrop's B-21 bomber is taking shape in Palmdale, California

The B-2 stealth bomber, above, took flight 30 years ago. Now Northrop is working on the next-gen B-21. (Al Seib / Los Angeles Times).

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