The Guardian understands the dramatic increase in security was carried out on the basis of an alert that came from a long-term intelligence source who has proved reliable in the past.
据卫报了解，这种安保力量的戏剧性增长是在一项长期情报源发出警告后实行的，在过去，这一情报源已证实了它的可靠性。
Intelligence experts are concerned the latest alert, while possibly averting a disaster, could compromise possible intelligence networks.
情报专家对最新的警告表示关注，虽然这可能避免了一场灾难，但是也可能使得导致发出这项警告的情报来源曝光。
The key, security experts say, is to stay alert and vigilant, preventing an attack before it happens and that, in turn, demands good intelligence.
安全专家表示，关键是保持警惕，在袭击发生之前将它们阻止。反过来，这需要充分的情报。
The key, security experts say, is to stay alert and vigilant, preventing an attack before it happens and that, in turn, demands good intelligence.
安全专家表示，关键是保持警惕，在袭击发生之前将它们阻止。反过来，这需要充分的情报。
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