... 反恐联盟 alliance against terror 恐怖警戒级别制度 terror warning system 恐怖阴影 shadow of terror ...
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terror warning system
恐怖警报系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。
New York has been on "orange" alert, or the second-highest level -- indicating a high risk of terror attack -- since the color-coded warning system was established after the September 11, 2001 attacks.
CNN: New York subway system on alert
The US is establishing a sophisticated computer system to provide early warning of a bio-terror attack on the country, it is reported.
BBC: Early warning system for bio-terror
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