中段攔截一次，終端攔截通常是兩枚攔一枚。假設漏一次的概率是1/20，三次全漏的概率是1/8000。

來源: 大觀園的賈探春於 2024-02-05 10:45:10 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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