I don't remember anything about abacus

來源: elfie 於 2024-08-01 15:12:19 [] [舊帖] [給我悄悄話] 閱讀數 : (99 bytes)
回答: 防老年癡呆：算盤和外語 由 tiger00 於 2024-07-31 17:44:29

It was taught at 3rd grade, about 40 years ago.

Who can remember all that? 

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