A novel rapid method to design optimal-fuel interplanetary trajectory for low-thrust propulsion is presented based on normal trajectory approach.

针对星际探测任务中燃料最省小推力转移轨道问题，提出一种基于标称轨道的快速设计方法。

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C. electric propulsion system, Because of the rapid progress of power electrics and computer technique, electric propulsion systems on vessels have developed to a higher level.

由于电力电子技术和计算机技术的进展，使现代电力推进系统发生了很大变化。

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Like its scaly counterpart, Water Runner uses a rapid slapping motion of the "feet" that provides enough propulsion for the bot to avoid sinking or tipping over.

ENGADGET: The miraculous CMU Water Runner