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。
Thus, people invented a more advanced calculating device the abacus.
于是，人们发明了更为高级的计算工具一一算盘。
An electronic length and area calculating instrument relates to a calculating device used for calculating the curve length and the area.
一种电子长度面积求算仪，涉及一种计算曲线长度和图形面积的求算装置。
An electronic length and area calculating instrument relates to a calculating device used for calculating the curve length and the area.
一种电子长度面积求算仪，涉及一种计算曲线长度和图形面积的求算装置。
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