step rocket英语解释
名词 step rocket:
- a rocket having two or more rocket engines (each with its own fuel) that are fired in succession and jettisoned when the fuel is exhausted
同义词：multistage rocket
step rocket例句
- One of the ways to make step rockets is to put the stages side by side at the bottom.
制造多级火箭的一种方法是把各级火箭并排放在底部。
