也许“震荡”一词并不准确，因为它们的设计是低频震荡，而且周期是间断性的。
Perhaps the term "vibrating" is not quite accurate since they are designed for low frequency vibration and the vibration cycle is intermittent.
也许“震荡”一词并不准确，因为它们的设计是低频震荡，而且周期是间断性的。
Perhaps the term "vibrating" is not quite accurate since they are designed for low frequency vibration and the vibration cycle is intermittent.
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