如果在给定时间间隔(例如在24小时的时段)内，至少一段时间用量未降至零，则指示有泄漏。
A leak is indicated if usage does not drop to zero, at least for a period of time, during a given time interval (e. g., during a 24-hour period).
在单个信号脉冲之间的至少一个或多个之前的时段的持续时间被作为对于实时待评估的时间间隔的量度。
The time duration of at least one or more preceding time periods between individual signal pulses is taken as a measure of the time interval which is currently to be assessed.
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