The Northrop Grumman B-2 Spirit is a terrifying piece of military kit. The stealth bomber can fly undetected for many thousands of miles to drop a thermonuclear bomb on pretty much any target on the planet. According to one government estimate, each B-2 in operation on average has cost the US Air Force $2.1bn to develop and deploy.
諾思羅普?格魯曼公司(Northrop Grumman) B-2“幽靈”是一種可怕的軍事裝備。這種隱形轟炸機能夠在不被發現的情況下飛行數千英里，向地球上幾乎任何一處目標投放一枚熱核炸彈。根據某一項政府估算，每架服役的B-2轟炸機的開發和部署花費了美國空軍21億美元。
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