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
the first settlers in America.
他们是第一批来美国定居的移民。
He that marries for wealth,sells his liberty.
为财富而结婚的人，出卖了自己的自由。
They were puzzled by several things.
有几件事情使他们感到迷惑不解。