公共广播系统（public address system）
an electronic amplification system used as a communication system in public areas
同义词： public address system / PA system / P.A. / PA
When they published it, it was big news for the high school - it was even announced on the P.A. system.
杂志发表了它，这在我们高中可算是个大喜讯，连广播里都作了公布。
Before long an emergency announcement came over the P.A. system: "This hotel is constructed to be absolutely earthquake-proof."
过了不多久从P. A .系统中传出紧急广播：“该旅店是完全由防震材料建筑而成。”
Under the Bretton-Woods system (1948-1971) inflation averaged 2.5% p.a.
FORBES: Gold, Reagan and the Reds: From Degraded Dollar to Downgraded Debt
Then in 2005, I accepted a position with the Montgomery County Public School system (MCPS) as an ESOL Teacher at Lois P.