pa /ˈpɑ, ˈpɔ/
 飛行員助手


 Pa n. A shortened form of Papa.

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 P.A.
      n : an electronic amplification system used as a communication
          system in public areas [syn: public address system, {P.A.
          system, PA system, PA]
      adv : by the year; every year (usually with reference to a sum of
            money paid or received); "he earned $100,000 per
            annum"; "we issue six volumes per annum" [syn: {per
            annum, per year, each year, annually]


 pa
      n 1: an informal term for a father; probably derived from baby
           talk [syn: dad, dada, daddy, papa, pappa, pater,
            pop]
      2: a short-lived radioactive metallic element formed from
         uranium and disintegrating into actinium and then into
         lead [syn: protactinium, protoactinium, {atomic number
         91]
      3: a unit of pressure equal to one newton per square meter
         [syn: pascal]
      4: a Mid-Atlantic state; one of the original 13 colonies [syn:
         Pennsylvania, Keystone State]
      5: an electronic amplification system used as a communication
         system in public areas [syn: public address system, {P.A.
         system, PA system, P.A.]