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
I think you ought to
我觉得，你们应该
When is the ship supposed to leave?
船应该在什么时候开？
Nice to meet you too! What class are you in?
我也很高兴。你是哪班的？