同样从13世纪开始，经过精密计算，绘制的地图更为精准，加上航海日志，使航行变得可靠而准确。

Also beginning in the thirteenth century, there were new maps refined by precise calculations and the reports of sailors that made it possible to trace one's path with reasonable accuracy.

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我们的价格是经过精密核算的。

Our price has already been closely calculated.

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这些仪器是经过精密调整的。

These instruments have been finely set.

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