According to a predetermined trajectory, ballistic missile with rocket engine propulsion takes a flight to intended targets under the action of the control system.

弹道导弹是用火箭发动机推进，在控制系统作用下按预定的弹道飞行至预定攻击的目标。

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This dissertation focuses on the study of a new launching technology of missile by the gun, in which the high-low launching theory is applied to the two-stage propulsion technology.

本文研究的就是一种用于炮射导弹的新型发射技术，即应用高低压发射原理的二次发射技术。

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Building that larger missile would require major advances in metallurgy, rocket engines, guidance and propulsion, and probably foreign assistance.

CNN: Commentary: North Korean launch not a cause for panic