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在一张圆硬纸板上对称地挖出八个一样大的齿形槽,在纸板的圆心处钉上一枚大头针,再把这枚大头针钉在一根木棍上,这就制成了一个频闪观测器。
Symmetrically digging eight equally toothed slots on a round cardboard, pinning a pin at the center of the cardboard, and then tacking the pin to a wooden stick creates a frequency Flash observer.