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
Grandma, I bet you have a lot of stories to tell.
奶奶，我敢打赌你会说很多故事。
Karl was so upset that he began to turn red with anger.
卡尔非常惊讶，红着脸开始生气了。
Look at the ice! Be careful! It's thin.
瞧那冰！当心！冰很薄。