Ppx
[计]= Packet Protocol eXtension,包规约扩充
🗣️ 情景例句
So long.
再见。
In fifty years there'll be twenty people per square yard, it is written here.
这里写着，再过五十年每平方码将要住着20人的人口密度。
They have been told that rescue operations are progressing smoothly.
他们一直被告知营救工作进行得非常顺利。