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公元前,有人把光的反射现象的本质解释为光线在行进过程中总是选择最短的路程。后来人们发现了光线在行进过程中总是选择时间最省的途径,这就是所谓“光行时间最省原
Before the BC, someone interpreted the nature of the light’s reflection as the light that always chose the shortest distance during the journey. Later, people discovered that the light is always the most time-saving route in the process of travel. This is the so-called ”lightest time".