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
how little quality time
高品质时光太少了
I get to work at nine o'clock every morning.
我每天早上9点钟上班。
among historians of science a new and more sophisticated picture has emerged.
但在科学史家中间，一个新的更加复杂的伽利略的形象出现了。