Ppx
[計]= Packet Protocol eXtension,包規約擴充
??? 情景例句
Are you involved in any extra-curricular activities on campus?
你在學校參加過任何課外活動嗎？
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順便來看看我。