为了抵消其轨道牵引力，任务控制中心必须使用f飞船自带的推进器定期将其推进到一个更高的轨道。

To counteract its orbital drag, mission controllers must use propellant in attached spacecraft to periodically loft the station to a higher orbit.

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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.

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但是这些系统都要求许多推进剂或推进燃料，并且没有缩小到立方体卫星合适的大小。

But the systems require a lot of propellant, or fuel, and haven't been miniaturized to the scale appropriate for a CubeSat.

youdao

Well, up until probably ten years ago, this was the primary propellant in just about every kind of spray thing that we had, hairspray, everything.

好吧，直到大概十年前，作为主要推进剂,存在于我们的每一个喷射器里，发胶，以及一切。

麻省理工公开课 - 固态化学导论课程节选

Let's say that you and your co-workers are trying to make a decision about whether to put a plan forward.

假如你和你的同事正在讨论是否需要推进一个计划。

It depends on 课堂 - SpeakingMax英语口语达人

The Market Revolution was driven, of course, by the growth of cities, which became market centers and manufacturing centers.

市场革命不断推进,当然,高速发展的城市是一大动力,它们正成为市场和工业中心

耶鲁公开课 - 美国内战与重建课程节选