abacuses

n.

算盘( abacus的名词复数 )；（圆柱）顶板；

1. The abacus is the ancestor of the modern computer.
   算盘是现代电脑的原型。
2. Can you use an abacus, Mr. Cooper?
   库珀先生，请问你会用算盘吗？

The origin and history of Russian abacuses.
Ancient computing technology : from abacuses to water clocks
古代计算技术:从算盘到水钟:from abacuses to water clocks
New Arithmetic and mathematics Education with the Aid of Abacuses
Numerical Abacuses Method based on the equivalence between the closest point projection and a geometrical bounded problem
Mathematics in "Abacuses": Definition and Distribution of "Troublesome Numbers"for Conducting Addition on an Abacus
[On laminar flow. Abacuses for the rapid calculation of free-sill spillways, [computation of hydraulic structures]]. [Italian]
Development of Cuttability Abacuses in Abrasive Waterjet Cutting With Regard to Depth of Cut and Roughness of Cut Surfaces
Evaluation of site effects: development of the semiquantitative abacuses in Lazio Region (Italy)
Evaluation of site effects: development of the semiquantitative abacuses in Regione Lazio (Italy)