Piot
abbr. 物质投入产出表（physical input-output table）
🗣️ 情景例句
I think I'll catch the train to work from now on.
我想从现在开始我会坐火车去上班。
How much is it by air mail?
航空信要多少钱？
Have they ever been there before?
他们以前去过那儿吗？