To combine audit trail with pre-alert to intrusion detection is very helpful for security monitoring.

因此，将审计跟踪与实时预警结合起来，实现实时的入侵检测是非常有意义的。

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For example, if the CPU utilization on a particular machine approaches a pre-determined threshold (for example, 85%), the monitoring system should alert the operator.

例如，如果某个特定计算机的CPU使用率达到了预定的阈值(例如85%)，则监视系统应向操作员发出警报。

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Most modern browsers pre-check each web page you visit and alert you if one is suspected of being malicious.

大部分最新的浏览器已能提前检查你浏览的每个网页，如果网站疑似有恶意软件，浏览器就会提示你。

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Although carried out on small numbers of women, the researchers say the test is highly accurate for predicting pre-eclampsia and could alert doctors early to the problem.

BBC: Pregnant woman

The board voted to send a Safety Alert to pilots warning them about the hazards of texting during the planning and pre-flight stages.

CNN: Pilot texting a factor in deadly copter crash