轨道天文台 Orbiting Astronomical Observatory ; OAO ; orbiting observatory
大型轨道天文台计划 great observatories program ; Great Observatories
天空之轨 Skyrail
天文轨道太空长官 Engineer Hydrocarbon Spacemaster Orbital ; Spacemaster Orbital
天域轨迹 Pilot's Path
无轨露天矿 trackless pit
轻轨或天铁 Sky Train
轨迹天生 path generation
天幕轨道 CYCLORAMA TRACK
天车导轨 Crane rail
最后一批进入美国空间站的宇航员创造了一项最长在轨时间（84天）的世界纪录。
The last team to visit that U.S. stationset a world record at the time for longest stay in orbit, 84 days.
在可见时间方面，天基空间目标光学监视系统对低轨目标的监视能力有限，而对高轨目标具有良好的监视性能。
On the aspect of observation time, it has limited efficiency for low earth orbit target space-based observation, and good efficiency for high earth orbit observation.
铱公司还说，它期望在30天之内用八颗在轨备用卫星中的一颗来替代失去的卫星。
Iridium also said it expected to replace the lost satellite with one of its eight in-orbit spares within 30 days.
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