1. which是指什么?书上说是指the horizontal component,但我觉得是指the wave movement.
2. it是指什么?
which 指代 the wave movement. 因为 wave movement is more complicated than its horizontal component.
it 指代 the path describled by a particle. 中性词为path。it would be more like that of... that为名词替代词,替代the path.
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