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本文简要地介绍了目前正在使用的各种主要导航系统的现状,以及在世纪之交中的命运,即是否能跨越世纪及其发展前景分析。
This article gives a brief overview of the current status of the various major navigation systems currently in use, as well as the fate of the turn of the century, whether it can span the century and its development prospects.