✔ 最佳答案
Abacus calculation = 珠心算
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um...I don't understand why the upon answer is "abacus is"....but the right way to say is abacus calculation......
anyways la...i hope my answer can help you..^^ Good Luck ar..
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haha...here is a website to teach how to use the abacus in english:
http://www.west-meet-east.com/abacus.htm
i think this is a good website..haha