India's own lunar orbiter descended to about 60 miles in 2008, he said, but was forced to return to a more stable, 125-mile-high orbit.

他透露2008年印度的月球卫星曾下降到60英里处，但又被迫回到了更为稳定的125英里高的轨道上。

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A space station in high orbit might be a convenient way station for future cosmonauts intending to visit mars.

太空轨道中的空间站对于想去拜访火星的未来宇航员来说也许是一个方便的小站。

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Although it is complicated in technology, space-based interception, which can intercept a target in any low, middle and high orbit, has more strategic value than ground-based interception.

天基拦截尽管技术复杂，但是可以拦截低、中、高轨道目标，比地基拦截更具有战略价值。

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The 13-tonne mission was initially lifted into a 350km-high orbit above Earth, with the expectation that the probe's big engine would fire twice - first, to raise that orbit, and, second, to set course for Mars.

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But unlike Iridium's 66 low-orbit birds, Astrolink will cover the earth with only four high-orbit geostationary fliers.

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The latest spacecraft was lifted by the Atlas into a 680km-high polar orbit.

BBC: Lift-off for latest Landsat mission