step-rockets
英
[s'tepr'ɒkɪts]
美
[s'tepr'ɒkɪts]
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英英释义
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
临近单词
step
Stepanov
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美
[s'tepr'ɒkɪts]
