The abacus, also called a counting frame, is a calculating tool used primarily in parts of Asia for performing arithmetic processes. Today, abacus are often constructed as a bamboo frame with beads sliding on wires, but originally they were beans or stones moved in grooves in sand or on tablets of wood, stone, or metal.Recent changes:********************Sound effects added.Highlight selected beads.Showing numerical values------------------------------------------------------Thanks to Emiko and Kazuo for your suggestions.------------------------------------------------------Please, send your comments to codingissimple@gmail.com 【基本信息】 作者:Google Play提供 更新时间:2013-05-18 版本:1 系统:Android 1.6以上 语言:英文
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