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Sheknewhowtoworkontheabacus.Asthestudentslearntomanipulatethebeadsontheabacus,theylearntoaddandsubtract.Startingthisyear,therewillbeaseparateadvancedclassforthestudentswh...
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发表于:2017-08-16
useanabacus;workanabacusDoyouknowhowtoworkanabacus?...
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发表于:2017-09-14
useanabacus;workanabacusIcanuseabacusskillfully.Learnhowtouseanabacus.Theyalsolearnedtousetheabacus.InEnglishwecallitanabacus.ButIaminterestedinusinganabacus.Effectsofmen...