Ppx
[计]= Packet Protocol eXtension,包规约扩充
🗣️ 情景例句
Are you involved in any extra-curricular activities on campus?
你在学校参加过任何课外活动吗？
I only had five dollars.
我只剩五美元。
He usually drops in at my place on his way home.
他常常在回家的路上顺便来看看我。