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長崎

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In mapping the effects of an atomic bomb, such as on the city of Hiroshima here, concentric circles are drawn centered on the point below the detonation and numbered at radial distances of 1,000 feet (305 meters). This point below the detonation is called "Ground Zero".

グラウンド・ゼロの定義と歴史的背景トリニティから広島・長崎まで

グラウンド・ゼロ爆心地トリニティ実験広島