For your Drupal site to be useful, the underlying server must keep an accurate clock.

为了让Drupal站点有意义，底层服务器必须维护一个精确的时钟。

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But new cell stations use GPS to take advantage of the highly accurate clock pulses transmitted by satellites.

但是，新型基站利用GPS，可充分发挥卫星发射的高精度时钟脉冲。

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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。

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Dr Wineland has, however, built a working clock with his atoms and it is the most accurate clock in history.

ECONOMIST: The 2012 Nobel prizes

With an accurate clock, you could take a reading from the sun at noon and figure out your longitude.

FORBES: Connect

Since it gets its time from the GPS satellites, all of which contain on-board atomic clocks, if your watch stops you'll always have an accurate clock handy.

FORBES: Magazine Article