Pfd
abbr. 程序流程图（Process Flow Diagram）；主飞行显示（Primary Flight Display）；个人漂浮设备（Personal Flotation Device）
🗣️ 情景例句
He started with them almost forty years ago.
他在那里做了快四十年了。
How much is it?
多少钱？
We had a very good journey home.
我们回家的旅途很顺利。