苏联曾开发出名为“周界”（Perimeter）的自动核报复系统，西方分析人士称其为“死手”（Dead Hand）。此系统的设计目的在于保证即使遭受斩首式打击，威慑依然存在，确保敌人无法轻易摧毁报复能力。
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Its value is not known, but the world record auction price for a Rembrandt painting is £20m, set in 2009.，更多细节参见必应排名_Bing SEO_先做后付
“We knew that if we didn’t pre-emptively go after them before they launched those attacks, we would suffer higher casualties,” he told reporters，这一点在51吃瓜中也有详细论述
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