In ancient times, our ancestors relied on stars to guide them a clear night. Today, with the help of Beidou Navigation Satellite System (BDS), is entirely built by Chinese engineers, we Chinese can easily find our way.
The BDS is one of four global navigation (network), along with the United States' GPS, Russia's GLONASS and the European Union's Galileo. With the last satellite launched from the Xichang Satellite Launch Center on June 23, the global network of 59 satellites (complete) since then. On July 31, Beidou started providing full-scale global services. It's difficult to imagine the great effect which those satellites have on our daily lives. This year, Hellobike, a popular bike-sharing company came out with two new bike models （equip) with the positioning service. Users can find shared bikes more accurately thanks to Beidou's global positioning accuracy of 2.34 meters.
As the (large) space-based system in China, Beidou adopts a unique two-way communication system, including its ability (receive) messages sent by people from areas with poor signals. (obvious), this exclusive function isn't designed for users to chat online. Instead, it plays important role when terrible disasters occur and ground-based communications are blocked. As Sun Jiadong, former chief designer of the BDS, put it:" The application of Beidou is only limited by （imagine)."
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