微型火箭附在宇宙飞船上，用来推进飞船飞向火星。
The tiny rocket is attached to the spacecraft and is designed to propel it toward Mars.
李子轩说，他小时候就听说过火箭和宇宙飞船。
Li Zixuan says that when he was a child, he heard about rockets and spaceships.
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。
From his father, he knew that scientists make rockets to carry things into space, and spaceships are used to carry people through space.
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