题目内容
有了"北斗", 中国就不必再依赖外国的定位系统了。
China no longer has to ________ ________ foreign positioning systems with Beidou.
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题目内容
有了"北斗", 中国就不必再依赖外国的定位系统了。
China no longer has to ________ ________ foreign positioning systems with Beidou.