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 更新時(shí)間：2013-05-18 版本：1 系統(tǒng)：Android 1.6以上 語(yǔ)言：英文