鉴于化学燃料火箭浪费太多的推进剂难以实现飞船速度的静变化，电力推进器仅仅使用一小点推进剂就可以做同样的任务。
Whereas chemical rockets waste too much propellant to reach a net change in spacecraft velocity, electric thrusters can do exactly the same mission using just a small fraction of the propellant.
迄今为止，围绕月球，共开展了73项科学探测任务，载人或者无人，以了解月球的化学成分，尤其是发现水，更是重点关注的项目。
There have been 73 missions, manned and unmanned, to the Moon, and understanding its chemical composition, particularly finding water, has always been a priority.
研究者希望化学反应后产生的氢，不仅能发射火箭，也能为长时间的空间任务补充氢电池。
Researchers hope that the hydrogen products of that reaction might go beyond launching rockets, and also feed hydrogen fuel cells for long duration space missions.
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