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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They should also inform their customers direct of the need for pre - cautionary measures e. g. on monthly statements, and display alert messages prominently on their transactional websites.

金管局亦指出银行应直接通知客户需要采取预防措施例如在月结单印上有关提示，并在交易网站的当眼地方显示提示信息。

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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