1、P.A. [personal account; private account ]
2、call out somebody's name over a P.A. system.
3、The Selection of Reference Genes in Chlamydomonas reinhardtii P.A. Dangeard by Real-Time Quantitative PCR
4、Before long an emergency announcement came over the P.A. system: "This hotel is constructed to be absolutely earthquake-proof."
5、When they published it, it was big news for the high school - it was even announced on the P.A. system.
6、有关风媒传粉是在昆虫稀缺或靠不住的时候才启用的论述，见Cox,P.A.1991.
