Ppa
abbr. 苯丙醇胺（phenyl-propanolamine）；并行处理自动机（Parallel Processing Automata）；实验性反应堆（Preliminary Pile Assembly）
🗣️ 情景例句
OK, OK- just try to calm down, sir.
好，好，请冷静下来，先生。
No garden without its weeds.
有利必有弊。
Cut it out.
省省吧。