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SCIENCE STUDY

BeiDou lights up sky

作者:TEENS
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北斗卫星导航系统:冉冉升起的“中国造”。

How do people find their way? Long ago, people did it by looking at the sun, moon and stars. Later, we started to use the compass (指南针). Today, there are satellite navigation (satnav) systems (卫星定位系统).
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