该系统需要18颗卫星才能覆盖俄罗斯全境，需要24颗卫星才能实现精确的全球导航。
However, the system requires 18 satellites to cover Russia; and 24 dependable satellites operating round the clock are needed for accurate global navigation.
在用于监测妇女和儿童健康状况的宽泛指标外，辅之以一组追踪性指标，包括八项覆盖率指标，可以更精确地显示短时期内的进展。
Broad indicators for monitoring the health status of women and children are supported by a tracer set of eight coverage indicators that can more precisely show progress over short periods of time.
测试团队能够利用新的用例，为增强覆盖率和有效性改善技术，同时获得更精确的范围定义和测试优先权。
Test teams using use cases are able to use new and improving techniques for enhanced coverage and efficiency, as well as more precise scope definition and test prioritization.
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