earth orbit

基本解释

NASA is retiring the shuttles in order to focus on developing the next generation of spacecraft that could go beyond low-Earth-orbit.
航空航天局正安排使所有航天飞机退役后，专注于发展第二代可飞越低地球轨道的飞机。
If all goes well, three “taikonauts” will embark Thursday on a three-day Earth-orbit mission, which includes the country’s first spacewalk.
如果一切顺利，三名“太空人”将于周四开始一段为期三天的太空之旅，其中一项任务是该国首次太空行走。
All but two of the plans call for commercial space companies to replace the Ares I rocket for low-Earth-orbit missions, and identify the Ares V as the corner stone of the NASA's future.
这两个计划几乎都要求商业航天公司更换执行地球低轨道飞行任务的战神1号（the Ares I）火箭，同时确定战神5号火箭是美国宇航局未来的中流砥柱。

In nineteen fifty-seven, a Soviet military rocket carried a small satellite into Earth orbit.
The number of man-made objects in Earth orbit has been growing each year.
It completes an orbit of the Earth in only ninety-seven minutes.

Others, including Pirate Party co-chairman Gregory Engels, seem to prefer the idea of a low-Earth-orbit satellite that would be harder to launch but easier to keep airborne than a slowly-deflating balloon.
FORBES: Pirates In The Sky: Filesharers Want To Build Weather-Balloon-Hosted Download Site