You might also use a timer variable to keep track of how many ticks of the clock you've been in the current state.

还可以使用计时器变量记录保持当前状态的时钟嘀嗒数。

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For example, you could set a cron job to run this script once per hour to help you keep track of how many PHP sessions are being used around the clock.

该脚本可用于完成许多任务，举例来说，您可以设置一个cron作业来每小时运行一次这个脚本，以帮助您跟踪24小时内所使用的php会话的数量。

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An outer layer on each of the eight surrounding pyramids selectively blocks out portions of the structures throughout the month, keeping track of the lunar cycle like hands on a clock.

周围8个金字塔中每一个上的外层有选择地摆出整个月的某一结构部分，像手上的钟表一样记录着月亮的周期。

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"Amtrak crews have been working around the clock to clear affected track of large amounts of snow, in excess of several fee in some cases, " the rail line said in a statement.

CNN: Northeast digs out; storms hit Upper Midwest, South

"He might get up this morning and call (coach) Ampie (Louw) and say he wants to be at the track at one o'clock, " Van Zyl said.

NPR: Newspaper Publishes Photo Of Pistorius In Blades

Progress is extended by reaching checkpoints before the clock winds down ala retro arcade racers, and no single run is alike thanks to a dynamically shifting track.

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