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Beidou double-star positioning system is built up by our country.
北斗双星定位系统(简称双星定位)是我国自行建立的一种定位系统。
youdao
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Double star position system is one kind of regional position system build up.
双星定位系统是一种区域性定位系统。
youdao
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Double star position system is one kind of regional position system build up.
双星定位系统是一种区域性定位系统。
youdao