Abacus Mental Arithmetic Ep.4 - Adding And Subtracting Numbers On The Abacus Without Rules (中文 Sub)

2021 6:59
Synopsis
購買算盤 : Buy an Abacus Online: 1) 17檔算盤 : https://amzn.to/34pIf4M 2) 17檔自動算盤: https://amzn.to/3ztzdnH 3) 23檔算盤 ...
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