Ppx
[计]= Packet Protocol eXtension,包规约扩充
🗣️ 情景例句
I applied for a job as a lifeguard at the community pool.
我申请了社区游泳池的救生员工作。
Every time the sheep bleats it loses a mouthful.
羊每叫一次，就少吃一口。
What was the population of the world in 1950?
1950年世界人口是多少？