Could our grandparents or grandparents' parents imagine that one day, we would be able to launch rockets, to have satellites in the sky?

### 解释 launch 是动词，意思是"发射、启动"，特别指将火箭、导弹或卫星等送入太空或空中的动作。这个词也可以用于描述船只下水或新产品的推出。