Gdf
n. 气体动力设备（Gas Dynamic Facility）
🗣️ 情景例句
Susan has told me a great deal about you.
Susan告诉我许多关于你的事。
The morning sun never lasts a day.
好景不常。
During my years in school, Annie sat beside me in every class.
在我求学期间，安妮每堂课都坐在我身旁。