Ppo
abbr. 聚对苯氧化物（poly - p - phenylene oxide）；胃蛋白酶最大排泄量（peak pepsin output）
🗣️ 情景例句
Robbie, maybe you should call them，
Robbie也许你应该给他们打个电话，
It must be rather difficult for us to push any sales if we buy it at this price.
如果我们按这个价格购买，将很能难推销。
Waves are the children of the struggle between ocean and atmosphere.
海浪是大海和空气相斗的产物。