1. A longitudinal reckoning by the navigator; made longitudinal measurements of the hull. 
   领航员进行经度计算；计算船身长度
2. By my reckoning, it must be 60 kilometres from here to the coast. 
   据我计算，从这里到海岸准有六十公里。
3. It was cloudy; and the captain had to calculate our position by dead reckoning. 
   空中阴云密布，船长不得不用罗盘测航法以确定我们的位置。
4. She can reckon rapidly on the abacus. 
   她用算盘算得很快。
5. They also learned to use the abacus. 
   他们还学习珠算。

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• 1. 珠算
  reckoning 算帐...reckoning by the abacus 珠算...reckoning in every item of income or expenditure 满打满算
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