"Coincidence of a higher torsional resonance with a machine speed is normally harmless because its development could only be triggered if an excitation were to occur simultaneously at various points along the train and properly phased." what is the meaning of "properly phased"?
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properly phased 相位合适 its development could only be triggered if excitation were to occur simultaneously at various points along the train and properly phased 只有当振动激励在多点同时发生而且相位合适的条件下才可能会引发共振的兴起。