I don't remember anything about abacus

来源: elfie 于 2024-08-01 15:12:19 [] [旧帖] [给我悄悄话] 阅读数 : (99 bytes)
回答: 防老年痴呆：算盘和外语 由 tiger00 于 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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