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To help answer this question, you must actively collect and maintain a baseline: extensive information about the state of the system at a time when that system is operating normally.

要帮助回答这个问题，您必须主动地收集并且维护一个基准：有关系统正常运行时的状态的广泛信息。

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The level of description was highly uneven, with some areas having extensive and detailed descriptions (for instance, state machines), while others had little or no explanation.

它所描述的层次有些地方具有某些广泛的和详细的描述(例如，状态机)，但是非常不平均，而其它的一些地方几乎没有解释。

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This fails to recognize the oil and gas production already was subject to extensive federal and state air quality regulations before the new rules.

FORBES: Why Anti-Fracking Groups Are Shifting Their Story From Water To Air Quality

Discounting is already extensive, given the state of the economy.

ECONOMIST: Business travel

With the troubled state sector undergoing extensive overhaul in a tough year, private businesses will need to provide more jobs.

CNN: AN IDEOLOGICAL MILESTONE