PA

名词 pa:

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

1. She works as PA to the managing director.
   她给总经理作私人助理。
2. I heard it on the PA.
   我从广播里听到的。