Circumstances that may constitute a crisis can never be entirely predicted. Implementation of this plan will always be based on analysis of the facts at hand.

危机发生的环境及状况是无法完全事先预知的，必须根据当时的状况灵活应对。

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And you've heard Jonathan Evans, the head of the Security Service recently giving a speech based entirely on the facts as the Security, Service knows this, about the scale of the potential terrorist threat.

BBC: Jack Straw MP. photo courtesy Jeff Overs