墙上时钟的指针伴着轻轻的嘀嗒声走着。10:30了。
The hands of the clock on the wall moved with a slight click. Half past ten.
示例：每500毫秒(墙上时钟时间)触发一次的探针。
Example: Probe to fire every 500 milliseconds (wall clock time).
至少从理论上讲，墙上时钟的指针可以向两个方向上转动。
In theory, at least, the hands of your clock can tick in both directions.
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