From his father, he knew that scientists make rocketsto carry things into space, and spaceships are used to carry people through space.
从他父亲那里,他得知科学家们制造火箭来把东西送入太空,而宇宙飞船是用来载人穿行太空的。
2
Later in the century scientists and technicians started to look at the practical purposes for which fireworks might be employed, such as using rocketsto help sailors establish their position at sea.
在该世纪后期,科学家和技术人员开始研究烟花的实际用途,比如利用烟花帮助水手确定他们在海上的位置。
3
Aiming for space is about more than understanding flight paths and knowing the best rocketsto use: moon shots are about taking risks.