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並前往https://www.aljazeera.com/news/2022/12/1/what-we-know-about-new-us-b-21-stealth-bomber-first-in-30-years

What we know about new US B-21 stealth bomber, first in 30 ...

It is, however, significantly cheaper, both to buy and maintain. The B-2 was horrendously expensive to keep airworthy and the B-21 will greatly ...

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