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Fermat's principle
comp.
费马原理
指最小时间原理
expl.
费马原理
地震波在两点间传播的射线路径是其传播时间对其所有邻近路径的一阶变分为零的那条路径。即传播时间是最小时〈在某些情况下是稳定值或最大值〉的射线路径
IT
费马原理
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