但他解释说，航天器的轨道寿命只能估测出约10%的准确度。
But he explained that a spacecraft's orbit lifetime could only be estimated to about 10% accuracy.
阐述了基本轨道应用分析理论，包括星下点轨迹计算、可见性分析、覆盖评估和轨道寿命估算。
Expatiated on the application theory of basic orbit, including subastral point calculation, visibility analysis, coverage evaluating and spacecraft life-span estimate.
在400公里高的轨道上，不推进的话，卫星的轨道寿命通常是几个月，200公里高度的轨道寿命是几周。
At 400 kilometers, orbital lifetimes are usually measured in a few months without re-boost. At 200 kilometers this drops to a few weeks.
该卫星将被定位于经过验证的1300公里的太空轨道上，将能够提供各种广泛的应用，使其设计服务寿命能长达15年以上。
The satellite will be based on the space-proven 1300 platform, which has the flexibility to support a broad range of applications, and is designed to provide service for 15 years or more.
事实上，这个轨道飞行器已经完成了它的全部任务，按照设计，它的寿命为6个月，到今年4月1日为止。
The orbiter had actually finished all its tasks within its designed life span of six months by April 1 this year.
计划于1986年送入轨道的空间望远镜将是第一个大口径、长寿命、多功能的轨道天文台。
The Space Telescope observatory to be launched into orbit in 1986 will be the first, long-lived, versatile orbiting observatory.
卫星在轨道上的寿命从几天到几百年不等。
Satellite lifetimes in orbit range from a matter of days to hundreds of years.
结合旋转电弧开关和环形轨道开关特点，设计了一种旋转电弧、场畸变气体火花开关，有效地减少了气体火花开关电极烧蚀，提高了气体火花开关寿命。
The high current which flows in the closing gas spark switch results in the electrode erosion that influences largely the switch performance especially for the lifetime.
对低地球轨道环境对航天器表面材料的影响和航天器表面材料的低地球轨道环境寿命评定方法进行了介绍；
This paper introduces the influence of the LEO environments on spacecraft surface materials and the evaluating technology of lifetime of spacecraft surface materials in LEO.
采煤机在运行中是沿牵引轨道行走的，链轨的受力状态与强度，对其使用寿命起决定性影响。
The mining machine operates along the track. The stress state and strength of chain track have deciding influence on its service life.
当卫星的使用寿命结束后，它们常常会被定位到遥远的轨道，不太可能危及正在工作的卫星。
When satellites reach the end of their useful lives they often are parked in remote orbits where they are unlikely to endanger working satellites.
为了保证无缝线路轨道的使用寿命及确保行车安全，对于无缝线路技术的研究显得越发重要。
In order to guarantee the safety and stability of high-speed train, the study of continuous welded rail (CWR) tracks has become more and more important.
为了保证无缝线路轨道的使用寿命及确保行车安全，对于无缝线路技术的研究显得越发重要。
In order to guarantee the safety and stability of high-speed train, the study of continuous welded rail (CWR) tracks has become more and more important.
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