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
I know that.
我知道。
When the light went out, I was cleaning the yard.
当熄灯的时候，我在清理庭院。
How many musicians are you bringing?
你打算带多少乐师来？