到目前为止，中国已经完成了北斗卫星导航系统的第三代网络系统，这是国家空间研究工作一个新的里程碑。
So far, China has completed the third generation network of China's BDS. It was a new milestone in the nation's space research work.
北斗卫星导航系统是中国第一个全球卫星导航系统。
为了完成北斗区域卫星导航系统建设提供的高精确度和高可靠性导航服务，中国将在未来两年里发射更多的卫星。
To complete a regional network to provide navigation services with high precision and credibility, China will launch more satellites within the coming two years.
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