题目内容

The GPS system consists of three segments: ⑴( ): the GPS satellites themselves;⑵( ):operated by the U .S. military;⑶( ): which includes both military and civilian users and their GPS equipments.

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What Is GPS？

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句子翻译（手写并拍照上传）：The high altitude insures that the satellite orbits are stable, precise and predictable, and that the satellites’ motion through space is not affected by atmospheric drag.

句子翻译（手写并拍照上传）：The system is designed to maintain full operational capability even if two of the 24satellites fail.