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阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

Rome wasn't built in a day.

Nearly two decades have passed since China sent 1. first Beidou satellite into space in 2000. In that time, more Beidou satellites were sent into orbit,2. (form) the Beidou Navigation Satellite System (BDS). In late 2012, it began providing positioning, navigation, timing and messaging 3. (service) to people in China and other parts of the Asia-Pacific region.

Now with two more Beidou satellites 4. (launch) on Dec 16, 2019, BDS has 53 satellites in orbit, 5. means the core (核心)of Beidou’s third-generation network is now 6. place. At the end of 2018 BDS started to provide global services. It's expected to greatly improve the system's 7. (able) to serve users worldwide. ''This marks Beidou's stepping into a 'global era' from its 'regional era'," BDS Spokesperson Ran Chengqi said at a news conference.

Although a satellite-based navigation system needs only 24 satellites to run 8. (proper), having 53 allow for better coverage. He added that future plans call for a 9. (smart) and more accessible system with Beidou at its core, to come online by 2035.

By then, we can probably say that Rome 10. (be) built finally.

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