1. Early warning was the course of defining alert, looking for the alert source, analysing alertness, determining alert degree, and absolving the alert. 预警是明确警情、寻找警源、分析警兆、预报警度和排警决策的过程。
2. Scientists on Wednesday raised the alert level for Anak Krakatoa and Tangkuban Prahu -- which regularly spew gas and rumble -- from "normal" to "warning, " the middle of three alert levels. 上周三，科学家们将喀拉喀托火山和唐库班珀拉胡火山的警戒度由“正常”提高到“警告”，三级警戒的中间等级，因为这两座火山近来定期喷出火山灰，并发出隆隆的声音。
3. Use this page to add the following alert: %1. By default, this alert will tell you when the document changes. 使用该页面可添加下列通知：%1。在默认情况下，在文档发生更改时，您将收到通知。
4. This is the safety-alert symbol. When you see this symbol on the machine or in this manual, be alert to the potential for personal injury. 这是提醒注意安全的符号，当您在机器上或本手册中看见这一符号时，请注意可能有人身伤害的危险。
