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
Don't be so grumpy.
别总这么爱抱怨。
We have a toll-free number for customers to call.
我们对顾客提供免费服务电话。
It sounds like you enjoyed it.
听起来你好象蛮喜欢的。