Global positioning system (GPS) is now the most precise global navigating. positioning and time broadcasting system around the world.
全球定位系统(GPS)是目前世界上精度最高的全球性导航、定位和授时系统。
Global positioning system (GPS) is now the most precise global navigating. positioning and time broadcasting system around the world.
全球定位系统(GPS)是目前世界上精度最高的全球性导航、定位和授时系统。
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