A heart attack or stroke may be the first warning of underlying disease. Symptoms of a heart attack include.

心脏病发作或中风可能是潜在疾病的最初警告。

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General Beauregard received early warning from Confederate spies that McDowell would attack. Much of his information came from a woman, Missus Rose o 'neal Greenhow.

包瑞德将军很早就从南方的间谍那得知麦克道尔将要对其发动进攻，他所得到的消息更多来自于一位女士，这位女士叫罗斯·奥尼尔·格林豪(Rose o ' Neal Greenhow)太太。

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Cisco is warning of three vulnerabilities within its Internet Operating System software that could allow a denial-of-service attack or let a hacker run arbitrary code on an affected switch router.

Cisco已经被警告,在Internet Operating System软件中具有三个可能引发拒绝服务,运行任意代码和系统出错的漏洞. "因为运行IOS的设备跨越数个不同类型的网络,第二轮大型拒绝服务攻击可能因此而起."

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Al-Shabab said it had advance warning of the attack and Mr Allex - a codename for the French intelligence agent - was not in Bulo Marer at the time.

BBC: Denis Allex: French agent 'killed' by Somalia al-Shabab

An IP reputation service, once the NASDAQ site had been identified as compromised through either publication or detection by continual IPS reputation evaluation, would have given system administrators early warning of the attack.

FORBES: How reputation services enhance IPS

In a crisis, the temptation would always be to hold these missiles on a hair trigger, to be launched on warning of an incoming attack rather than lost to an enemy strike.

ECONOMIST: It's worse than you thought