资料来源 : pyDict

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资料来源 : Webster's Revised Unabridged Dictionary (1913)

Pulsion \Pul"sion\, n. [L. pulsio, fr. pellere, pulsum, to
   drive: cf. F. pulsion.]
   The act of driving forward; propulsion; -- opposed to
   {suction} or {traction}. [R.]