Gdf
n. 气体动力设备（Gas Dynamic Facility）
🗣️ 情景例句
Don't be lazy, the older you get, the harder it will be to learn.
别偷懒，年纪越大，学起来就越难。
What we are ignorant of is immense.
我们不知道的东西多得不可胜数。
'Certainly,' the girl said, 'but they're for next Wednesday's performance.
“当然可以，不过这两张票是下星期三的，