The development of hybrid rocket engine in abroad was introduced in this paper.

介绍了国外固液火箭发动机研制的进展。

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There's actually another kind of hybrid: rocket engines.

事实上还有另外一种混合动力引擎：火箭引擎。

youdao

There's actually another kind of hybrid: rocket engines.

事实上还有另外一种混合动力引擎：火箭引擎。

youdao