quick·step /-ˌstɛp/
  快步,快步進行曲,急拍的狐步
  Quick·step n. Mus. A lively, spirited march; also, a lively style of dancing.
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  quickstep
       n 1: military march accompanying quick time
       2: a ballroom dance with both quick and slow steps
       v : perform a quickstep
       [also: quickstepping, quickstepped]