2. 职称英语
  3. 2000年，中国建成北斗导航试验系统，这使中国成为继美、俄之后世界上第三个拥有自主卫星导航系统的国家。 虽然目前它的定位精度与GPS还有一定的差距，

2000年，中国建成北斗导航试验系统，这使中国成为继美、俄之后世界上第三个拥有自主卫星导航系统的国家。 虽然目前它的定位精度与GPS还有一定的差距，

游客2023-12-28  18
问题    2000年，中国建成北斗导航试验系统，这使中国成为继美、俄之后世界上第三个拥有自主卫星导航系统的国家。
   虽然目前它的定位精度与GPS还有一定的差距，但它具备了GPS所没有的短报通信和位置报告的功能。在没有手机信号的地方，用户也可以通过该系统发送短信。
   2008年四川汶川大地震后，灾区电话无法接通，手机信号中断。救援人员将北斗导航终端带入灾区，及时保持了与外界的通信联络。
   该系统的位置报告功能可以帮助交通管理部门掌握行驶车辆的位置，及时疏导交通，缓解交通拥堵状况。
   虽然北斗卫星导航系统是中国独立发展、自主运行的卫星导航系统，但这并不影响它与世界上其他卫星导航系统之间的兼容性。用户在同时使用北斗和GPS这两种导航系统时，定位和导航效果会更好。
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答案    In 2000, by launching the Beidou navigation experiment system, China became the world’s third country to have an independent satellite navigation system, after the United States and Russia.
   Although it still lags behind the GPS in terms of positioning accuracy, the Beidou system has such functions as short messaging and location reporting that the GPS lacks. Even in places with no mobile phone signals, users can still send out short messages through this system.
   In the wake of the massive earthquake that hit Wenchuan, Sichuan province in 2008, telephones were disconnected and mobile phone services stopped in the earthquake-stricken areas. Rescuers took Beidou navigation terminals with them, thus speedily restoring telecommunications links with the outside world.
   Beidou’s location reporting function enables the traffic control authorities to track motor vehicles on the road and quickly ease traffic congestion.
   Although the Beidou is a satellite navigation system developed and operated independently by China, this does not affect its compatibility with other satellite navigation systems in the world. By using both the Beidou and the GPS at the same time, people will receive more accurate positioning and navigating services.
解析    原文简述了北斗导航系统的优势、功能及与其他系统的兼容性等特性。第一段介绍了中国建成北斗导航试验系统的时间及国际地位。第二、三、四段介绍了北斗导航系统的优势和功能。最后一段将北斗导航系统与其他系统做了对比。
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