The F-15's electronic warfare system provides both threat warning and automatic countermeasures against selected threats.

F - 15的电子战系统能自动提供告警，并对选定的目标实施自动电子对抗。

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The Department of Homeland Security raised its colour-coded threat warning to red, for certain flights, for the first time since its inception.

美国国土安全局将威胁警报设为红色，这是自设立以来的第一次。

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The WHO moved a meeting scheduled for Tuesday to Monday to decide whether to raise its pandemic threat warning level by a notch, from 3 to 4 (on a scale of 6).

世界卫生组织将一项会议安排从周二提前到周一，会上将确定是否将其流行病威胁预警调高一个等级，从3调至4（总共有6个等级）。

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The WHO's Phase 5 threat warning signals that a global pandemic could be imminent, but has yet to develop, with human-to-human transmission occurring in many geographical locations.

VOA: standard.2009.04.30

Israeli and Indian media report the Counter-Terrorism Bureau in Jerusalem has upgraded a warning to Israelis and other foreigners traveling in India about a "concrete threat" against Jewish facilities here.

VOA: standard.2009.10.16

So if there is a heightened threat warning I would advise my friends and family to be cautious.

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But Cilluffo said that while the system is in need of a "significant tune up, " there is some merit in having a threat warning and advisory system.

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The Task Force suggested the application of sanctions in two stages, with the threat of "a warning, a fine or the playing of a match behind closed doors" for "a first or minor offence".

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