5和10不就都進上去了嗎？日本算盤就沒有頂珠和底珠，算盤珠的形狀也跟中國的不一樣。

來源: 走資派還在走於 2020-12-11 16:38:31 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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