Rocketry
n. 火箭研究
📖 牛津释义
rocketry
n[U]
(science or practiceof) using rockets for propelling missiles or spacecraft 火箭学; 火箭技术.
🗣️ 情景例句
I have always worn a clip-on bow tie.
我都是用夹上去的领结。
He has a writig brush.
他有一支毛笔。
Thanks very much. I must go!
谢谢，我必须走了。