我至今不明白算盤最上頭那排珠子和最低下那排珠子是幹什麽用的。日本算盤是上頭一排珠子，下頭四排珠子

來源: 走資派還在走於 2023-08-25 22:14:47 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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