When the hydrogen used as fuel vanishes, and fusion slows, gravity causes the star to collapse in on itself.
当作为燃料的氢消失，且聚变过程减缓时，重力就导致恒星向内坍缩。
NASA calls this a gravity assist, and exploits it to save fuel in missions to outer planets such as Jupiter and Saturn.
美国航空航天局称这是一个重力辅助，并利用它来节省执行去木星和土星等外行星的任务时消耗的燃料。
Lifting heavy spacecraft and fuel out of the Earth's gravity is expensive.
将沉重的航天器和燃料送出地球引力以外费用昂贵。
Up to the present, active dry yeast has been widely in liquor-making industry, high gravity fermentation, and fuel alcohol industry.
目前，酿酒活性干酵母广泛应用于酿酒工业和酒精的浓醪发酵以及燃料酒精工业。
The problem of how to design the ordering of provided fuel in condition of given limitations to the centre of gravity is solved.
解决了在给定重心活动范围情况下供油顺序设计问题。
When massive stars exhaust their nuclear fuel and can no longer resist the relentless, crushing force of gravity, they collapse violently.
当耗尽核燃料的时候，大型恒星再也抵挡不住核心引力造成的残酷的粉碎性重压，它们发生剧烈塌缩。
In this paper, liquid water on the performance of a PEM fuel cell and mass transport is observed on different electrode relative position under gravity effect by experiment.
通过试验，观察了在重力作用下液态水对PEM燃料电池性能及其内部传质的影响，分析了PEM燃料电池单体电极的不同摆放位置对其性能的影响。
Furthermore, an attainable set for initial conditions of the gravity-turn descent is deduced according to the constraints of thrust, fuel and states of the soft landing system.
此外，根据软着陆系统推力、燃料和状态的约束条件，给出了引力转弯着陆过程初始条件的可达集合。
Furthermore, an attainable set for initial conditions of the gravity-turn descent is deduced according to the constraints of thrust, fuel and states of the soft landing system.
此外，根据软着陆系统推力、燃料和状态的约束条件，给出了引力转弯着陆过程初始条件的可达集合。
应用推荐