SCIENCE STUDY

China’s own navigator

作者：CHINA DAILY-TEENS

中国的骄傲——北斗卫星导航系统。词数 386 建议阅读时间 6分钟测试见 IV版

Many years ago, people relied on the sun, moon and stars to find their way around. Later, the compass was introduced. And now, we have satellite navigation (satnav) systems to guide us.

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