on the abacus 在算盘上
reckoning by the abacus 珠算 ; 用算盘计算
The chinese invented the abacus 您
The invention of Abacus 算盘 ; 算盘的发明
The Vitality of Abacus Calculation 谈谈珠算的生命力
In response to declining math skills among their students, some Japanese schools are bringing back an ancient calculating device—the abacus.
为了应对学生数学能力的下降，日本的一些学校重新使用起一种古老的计算工具——算盘。
The abacus was perhaps the earliest type of computer.
算盘可能是最早的一种计算机。
Why is the abacus such an effective teaching device?
为什么算盘有效地帮助了教学？
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