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。
Assume Bob had a dog “Snoopy” on a leash and it walks along the road, while Bob was standing still. If the dog follows the road once and comes back to Bob, this results in the leash being wrapped around the hole in his space: In other words, Bob would need to walk around the hole once to untangle it.，推荐阅读体育直播获取更多信息
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Жители Санкт-Петербурга устроили «крысогон»17:52，这一点在搜狗输入法2026中也有详细论述
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