A 可以指事物，比如一個筆記本。BA 可以是同樣的筆記本，但裏麵夾了一張卡片。

來源: Shubin 於 2023-12-01 19:01:22 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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