However, the system requires 18 satellites to cover Russia; and 24 dependable satellites operating round the clock are needed for accurate global navigation.

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。

youdao

Such as a navigation, notepad, Internet, calendar, clock, calculator, recording, player… A variety of functions witnesses the human progress.

比如导航，记事本，上网，日历，闹钟，计算器，录音，播放器……多种功能见证着人类的进步。

youdao

Since the Rubidium clock drifts very slowly, an alternative navigation algorithm was designed for Rubidium clock constrained GPS using the adaptive low-pass filter.

由于铷钟的漂移非常缓慢，基于自适应低通滤波器，设计了一种导航算法用于铷钟约束的GPS。

youdao

One thing that propelled the great scientific, commercial, and cultural thrusts of the past 1, 000 years: time and time-keeping, which have given us navigation, the factory clock and the diminishing attention span.

ECONOMIST: Letters