| 单词 | GPS (Global Positioning System) |
| 释义 | GPS (Global Positioning System) A satellite-based navigation system comprising a constellation of 24 Navstar satellites launched by the United States Department of Defense from 1978 to 1994.The satellites are in multiple medium-earth orbital (MEO) paths at altitudes of approximately 11,000 miles, and are 74570c07.qxd 9/11/07 12:21 PM Page 209 |
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