alerts

n.

condition of heightened watchfulness or preparation for action

"bombers were put on alert during the crisis"

同义词：qui vive

a warning serves to make you more alert to danger

同义词：alerting

an automatic signal (usually a sound) warning of danger

同义词：alarmwarning signalalarum

1. The weather service issued alerts for severe thunderstorms in the area.
   气象局对该地区发布了严重雷暴的警报。
2. She set up alerts on her phone to receive notifications for important emails.
   她在手机上设置了通知，以接收重要邮件的警报。