到目前为止，中国已经完成了北斗卫星导航系统的第三代网络系统，这是国家空间研究工作一个新的里程碑。

So far, China has completed the third generation network of China's BDS. It was a new milestone in the nation's space research work.

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这里，所有流活动在一个技术事务内运行，导航全部在内存内完成，中间状态不会存储到数据库中。

Here the entire set of of flow activities runs within one single technical transaction, navigation is all done in memory, and the intermediate state is not saved to a database.

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导航所要完成的最大任务，是清晰地引导用户到达网站的不同地方。

The most significant task a navigation menu has to accomplish is to unambiguously guide visitors through different sections of a website .

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