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p.a.

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p.a.英语解释

名词 p.a.:

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

副词 p.a.:

  1. by the year; every year (usually with reference to a sum of money paid or received)
    同义词:per annum, per year, each year, annually
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