根因不是唯一的

來源: 大醬風度於 2022-03-29 07:57:29 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

一根杆，上麵掛個重物，斷了。

什麽是根因? 是杆不結實，還是重物太重?

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