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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这称为“危险距离”打击，要求高度协同和精密计算来确保友军不被误击。

This is known as a "Danger Close" strike and requires extra coordination and finesse to ensure that friendlies are not struck.

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就群体看死亡率来下定义，如要说得准确，我称之为“群体逃逸速度”或“保险精密计算师的逃逸速度”。

It's defined on the population, looking at mortality rates, so when being precise I call it "population escape velocity" or "actuarial escape velocity".

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