Gdf
n. 气体动力设备（Gas Dynamic Facility）
🗣️ 情景例句
I'm stressed out. I need a vacation.
我筋疲力尽了，我要休假！
A wonder lasts but nine days.
新鲜事儿不久长。
But why did white people want to catch Africans and put them in chains?
但是为什么白人要把非洲人抓起来，戴上镣铐呢？