The attack was unsuccessful and served only to alert the enemy.

进攻未奏效，反而使敌人警觉起来。

《牛津词典》

youdao

youdao

Pyongyang also promised to alert the South if similar situations arise in the future.

VOA: standard.2009.09.09

In case any of you would like to get involved in research there are very often colleagues of mine or graduate students who are doing interesting projects who will ask me to alert you to the possibilities of working with them.

如果你们希望参与研究,我的同事和我带的研究生,正在做一些很有意思的项目,他们会让我把这些信息告知你们

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This is more of a spoiler alert, but you've had 41 years to see this movie.

它不只是一个扰流警报，但是你用了41年来看这个电影。

哈佛公开课 - 计算机科学课程节选

Security necklaces are available at the gym entrance, which members can use to alert police.

FORBES: Magazine Article

Students and faculty received e-mails to alert them to the event, CNN affiliate WCVB reported.

CNN: Violence haunts Boston area in wake of Marathon terror

It uses "sentinel" dealers to alert GM to problems outside of established norms--like an abnormal disease.

FORBES: Magazine Article