They may have used pebbles to calculate, for the word " calculus " means " pebble ".

他们也许是用石子来作计算的, 因“calculus ” 这个字原意是 “ 石子 ”.

辞典例句

This value is close enough and easier to calculate for range work.

这个接近值对于计算比较容易对于距离计算已经足够了.

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He shall also calculate for export price, normal price, and price regulation when the appeal occurs.

做好企业申诉时出口价格 、 正常价值 、 价格的调整、数据计算等工作.

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